Professional 10+ Assistant Outfit Ideas for the Office

Your assistant outfit has to do more than look good in a mirror selfie. It has to survive a day of balancing coffee trays, bending to restock supply cabinets, and walking across a sprawling office campus — all while sitting through meetings in a conference room that’s freezing, then a cubicle that’s stuffy, then both at once. Most workwear advice assumes you stand still long enough for the fabric to settle. You don’t. That’s the disconnect, and it’s the reason so many professional attire for assistants recommendations miss the mark entirely.

This is why you need an assistant wardrobe that considers seated versus standing fit — and why it helps to avoid the orphan wardrobe trap when you’re trying to make every piece earn its place.

19 Assistant Outfit Solutions That Work All Day

These 19 combos are built for the actual demands of an assistant’s agenda — temperature swings, sitting marathons, and surprise client handshakes. Each one solves a real problem you’ll face before lunch.

Monochrome and Tailored

A black-and-white palette eliminates morning guesswork. These five looks rely on sharp cuts and clean lines to project competence without fuss. But keep the sitting-to-standing problem in mind: a pencil skirt that looks great standing might ride up when you sit.

White Blouse, Black Skirt, No Decisions

by Pinterest

A white fitted short-sleeve blouse tucked into a high-waisted black pencil skirt creates the most straightforward assistant outfit there is. Add sheer black tights and black pointed-toe heels, and you’re ready for a day of printing, greeting, and note-taking. This silhouette is fitted through the torso with a streamlined, hourglass shape that reads as professional without screaming it. Check the back hem of the blouse before you leave the house — if it gapes near the waistband when you lean forward, it’ll expose your lower back every time you reach for a file. This look thrives on precision, not trend. Keep the jewelry minimal and the iron hot.

The Corset-Blouse Layer Trick

by Pinterest

A black strapless corset-style top layered over a white long-sleeve blouse with a neck tie gives this trouser combination editorial weight. The black wide-leg trousers and pointed-toe heels elongate the frame, while the corset defines the waist without a belt. You get the polish of a suit without the bulk of a blazer. The neck tie should sit flat; if it twists, it’ll look like a last-minute idea rather than a deliberate styling choice, so starch it lightly and re-tie at lunch if needed. The monochrome palette keeps it office-ready, but the corset adds a modern edge that works especially well in creative or tech-adjacent offices. Pair with a black top-handle bag for a finished, confident arrival.

The Lace-Layered Shift Dress

by Pinterest

A black sleeveless shift mini dress sits over a white lace long-sleeve blouse, creating a layered look that’s more interesting than a basic dress but just as simple to execute. Sheer black tights and black pointed-toe heels keep it office-appropriate, and a black structured tote handles the practical needs. This outfit has a clean, straight silhouette that doesn’t cling, making it a reliable choice for sitting through long meetings. The lace sleeves are the focal point; inspect them for loose threads or snags before wearing, because one caught thread can turn a delicate detail into a distraction. It’s polished enough for reception duty yet doesn’t look like you’re trying to outdress anyone. A silver ring adds just enough shine.

Your Go-To Minimal Mini Dress

by Pinterest

A black short-sleeve mini dress with gold-tone button details does the work of a full suit in one piece. The fit is tailored and streamlined, hitting just above the knee, so it’s sharp without being restrictive. Black pointed-toe heels and a structured top-handle bag with a gold clasp echo the buttons, creating a pulled-together look that takes under two minutes to assemble. Gold-toned buttons can tarnish or loosen over time; check them weekly and tighten any that wobble, because a missing button on this dress transforms it from luxury to careless. This outfit is perfect for days when you can’t think about coordinating separates but still need to look like you’re in control. Silver accessories, like a pendant necklace and bracelet stack, add contrast against the warm gold accents.

The Sleeveless Power Suit

by Pinterest

A black sleeveless shoulder-padded top paired with high-waisted black wide-leg trousers creates a cohesive, elongated line that reads as a suit without the jacket. A black belt with a gold buckle and black pointed-toe heels reinforce the silhouette. This is power dressing for days when you’re on your feet as much as in a chair — no sleeves to roll up, no cuffs to stain. The shoulder pads should sit precisely on your natural shoulder edge; if they extend beyond, they’ll make you look like you’re borrowing someone else’s clothes, which undermines the authority you’re projecting. Add a gold wristwatch and a ring, and you’ve got a minimalist office look that photographs well in the mirror selfie you’ll take before leaving. Keep the bag structured and black.

Waistcoats and Cropped Jackets

A good structured layer changes your silhouette instantly. These two looks prove that you don’t need a full blazer to look put-together — a waistcoat or a cropped jacket does the job with less bulk and more personality.

The Navy Vest Trio

by Pinterest

A navy tailored vest over a light blue button-up shirt gives you the polish of a three-piece suit without the jacket. Navy wide-leg trousers extend the line, while burgundy pointed-toe heels add a controlled pop of color that keeps the outfit from falling into uniform territory. A silver wristwatch, thin necklace, and glasses complete the “I’ve got this” vibe. When wearing a vest over a collared shirt, button the shirt all the way up; an open collar peeking out of a vest looks accidental, not relaxed. This outfit works especially well in legal or corporate offices where formality is still expected but you need to move freely. The pink smartphone case is a tiny, humanizing detail — leave it, don’t hide it.

The Gold-Button Cropped Jacket

by Pinterest

A black cropped embellished jacket with gold buttons sits sharply over a white crew-neck top, creating a high-contrast focal point. High-waisted gray pleated wide-leg trousers balance the crop with volume below, and a black leather belt with a gold buckle ties it together. Black pointed-toe slingback heels add a feminine finish. The jacket’s cropped length means your belt and trousers will be visible; choose a belt with clean lines and tuck in your top neatly, because any bunching at the waist will be on display. Small hoop earrings are all the jewelry you need — the gold buttons already do the talking. This look channels a modern, slightly Parisian office aesthetic that feels current without being trendy. It’s an excellent choice for days that include client interaction or photo ID snapshots.

The Cardigan System

Cardigans are the unsung heroes of an assistant wardrobe — they layer over anything, stash on a chair, and handle AC blasts without looking like you’ve given up. These four outfits put a soft knit to work so you can concentrate on the job, not the thermostat.

The Beige Ribbed Cardigan Base

by Pinterest

A beige ribbed button-front cardigan becomes a reliable anchor over a black fitted tank top. Black high-waisted straight-leg trousers and black pointed-toe heels sharpen the look so it doesn’t drift into weekend errand mode. The cardigan’s ribbed texture adds subtle depth to an otherwise flat neutral pairing. Button only the middle two buttons of the cardigan; it creates an A-line effect that flatters the torso and keeps the fabric from pulling when you reach across your desk. A black structured tote and small hoop earrings finish the outfit with a quiet, professional hum. This is the kind of look that works for internal meetings, quick runs to the supply closet, and everything in between — no costume change required. The beige-black palette is as low-risk as it gets.

The Forest Green Cardigan and Sneakers

by Pinterest

A dark forest green button-front cardigan layered over a white fitted crew-neck top brings a dose of color without shouting. Black wide-leg trousers keep the base streamlined, and white sneakers with green stripes make the outfit walkable for a day that includes campus errands or a lengthy commute. A beige oversized tote balances the dark tones. The ID badge lanyard can clip onto a cardigan button; never let it dangle loose, because it’ll swing into coffee cups and door handles all day. The silver wristwatch and delicate necklace are just enough jewelry. This outfit sits in the sweet spot between polished and approachable, ideal for offices where you’re the first face people see. It also photographs well for those inevitable “what I wore” documentation shots.

The Gray Cardigan Cocoon

by Pinterest

A heather gray oversized cardigan wraps over a white fitted top, creating a soft cocoon that doesn’t sacrifice shape thanks to the high-waisted black wide-leg trousers. A black leather belt with a gold buckle defines the waist, and cream pointed-toe slingback flats keep things feminine and floor-friendly. Oversized cardigans look best when the sleeves are pushed up slightly to expose the wrist; it signals that you’re ready to work, not just bundled against the cold. Gold chain necklace and hoop earrings add a touch of warmth to the gray, and the light gray structured tote is large enough for a lunch bag without looking like a beach bag. It’s a quiet luxury look on a reasonable budget.

The Cream Cropped Cardigan Casual

by Pinterest

For the most relaxed days in your assistant rotation, a black square-neck sleeveless top and a cream cropped knit cardigan pair with black wide-leg trousers and white sneakers. The cropped cardigan stops at the waist, creating definition without a belt. This is the outfit for when you’re confident the office is in casual mode but you still need to look intentional. Cropped cardigans can ride up when you reach overhead; keep an eye on it before standing up from your desk, because a sliver of midriff appearing in a corporate setting is a mistake you don’t want to make. The lanyard ID badge reminds everyone you’re on duty, and the clear iced drink cup adds a touch of real-life chaos. It’s approachable, not sloppy.

Relaxed Shirts and Wide Legs

When your day includes as much walking as sitting, you need clothes that don’t fight back. These four outfits use relaxed shirts and wider leg shapes to give you room to move, bend, and breathe — without losing the professional edge.

The White Shirt and Straight Jeans

by Pinterest

A white button-down shirt tucked into medium-blue high-waisted straight-leg jeans is a classic smart-casual combination that works for many modern offices. Black pointed-toe heels upgrade the denim, and gold bracelets plus a ring add a touch of polish. Roll the sleeves to just below the elbow — it keeps the look crisp but not stiff, and prevents the cuffs from dragging through whatever you’re doing. This outfit is ideal for creative or tech settings where a full suit would feel like cosplay. When jeans are permitted, the business casual gray area demands you aim for dark, clean denim and polished shoes — anything less and you’ll look off-duty, not off-duty professional.

Gray Trousers and Clean Sneakers

by Pinterest

A black long-sleeve fitted top anchors charcoal gray high-waisted pleated wide-leg trousers, creating a long, lean line that looks tailored even though it feels like loungewear. Black-and-white sneakers keep the outfit grounded, and a black-and-white woven tote pulls the palette together. If your office frowns on sneakers, swap them for sleek black loafers, but check the sole — a rubber sole is quieter and more comfortable for the non-carpeted stretches of your day. I’ve argued before that comfortable shoes aren’t a concession; they’re a necessity when your job has you on your feet for half the day. Just make sure the silhouette is sleek and the shoes are clean. This outfit appears put-together on Zoom while letting your feet survive the 8,000 steps an assistant often logs.

The Oversized White Shirt and Kitten Heels

by Pinterest

An oversized white button-up shirt worn open over a white fitted tank top strikes a balance between structure and ease. Black tailored ankle-length trousers and tan-and-black slingback kitten heels introduce a refined, low-key contrast. A black-and-tan belt with a gold buckle ties the two tones together, while a black quilted shoulder bag with a chain strap adds texture. Oversized shirts can drown you if they’re too long; check the back of the shirt in a mirror — if it extends past your hip line when untucked, consider a quick French tuck at the front to show the belt. Gold bracelet and small hoop earrings complete this minimalist, polished look that works for meetings, mail runs, and the inevitable after-work obligation you forgot about.

The Light Blue Oversized Shirt and Flares

by Pinterest

A light blue oversized button-up shirt over black high-waisted flared trousers creates a retro-modern silhouette that’s both crisp and comfortable. Black pointed-toe heels elongate the flare, and a black structured tote plus lanyard with phone case ground it in assistant reality. Sunglasses perched on your head add a bit of off-duty cool you can shed the second you’re indoors. Flared trousers pool and fray if they’re too long; aim for a hem that breaks just above the floor when you’re wearing your chosen heels, not flats. The wrong hem length can sabotage even the most expensive flares, so budget for tailoring if you buy off-the-rack. This light blue shirt reads as approachable — exactly the vibe you want when you’re the gatekeeper for a busy executive.

Pattern, Texture, and Warm Neutrals

When you want more visual interest than a solid palette but can’t risk a pattern that distracts, these four outfits blend checks, plaids, and warm brown tones into a professional wardrobe that still feels like you.

The Plaid Midi Skirt Academic

by Pinterest

A white button-up blouse and a brown plaid midi skirt tap into academic heritage with a polished, assistant-appropriate spin. The dark brown leather belt cinches the waist, and black sheer tights plus black heeled loafers keep it office-ready. Round wire-frame eyeglasses complete the bookish but intentional look. A midi skirt that grazes the top of your loafers can shorten your visual length; opt for a skirt that hits mid-calf rather than lower, and pair it with heels that show a sliver of ankle when seated. This outfit is a smart choice for legal or educational settings where a bit of personality is allowed but not an excess. The plaid pattern breaks up the monochrome without being loud. A dark ponytail with bangs adds a neat, composed finish.

The Checkered Trouser Edit

by Pinterest

High-waisted brown-and-cream checkered tailored trousers serve as the statement piece here, paired with a black sleeveless turtleneck that dials the volume down. A black leather belt and black pointed-toe heels continue the clean vertical line. This look rides the line between vintage charm and modern minimalism. Checkered patterns can emphasize any hip asymmetry if the fit is too tight; choose trousers with a relaxed straight leg and have the waist taken in professionally if needed — don’t rely on a belt alone. The clear stemmed glass accessory in the photo might be a staged prop, but in real life, swap it for a neat water bottle that doesn’t sweat onto your desk. This outfit shines in creative or architecture-adjacent workplaces where a little visual wit is expected.

The Beige-and-Brown Warmth Formula

by Pinterest

A beige ribbed sleeveless mock-neck top tucked into high-waisted brown tailored wide-leg trousers is a masterclass in tonal dressing. Dark brown pointed-toe heels and a brown shoulder tote extend the monochromatic cocoa palette, while a dark brown leather belt with a gold buckle adds definition. When wearing similar tones head-to-toe, texture is what keeps it from looking like an uniform; without it, you risk the all-neutral trap that reads as flat and uninspired. Ensure at least two different fabrications (ribbed knit top and smooth suiting trousers, for example) are touching. Small stud earrings are all you need — the gold buckle does the accessorizing. This outfit is particularly flattering in natural daylight, making it a good choice for days with off-site errands.

The Black Blouse and Brown Trousers

by Pinterest

A black button-up blouse tucked into high-waisted brown wide-leg trousers creates a sharp, professional contrast that’s a step up from all-black without any risk. A black leather belt, black pointed-toe flats, and a black structured handbag keep the accessories streamlined. Gold wristwatch, bracelet, and hoop earrings add the right amount of warmth. Flats with a pointed toe can pinch by the end of the day; size up by half a size and add a thin cushioned insole — your feet will swell slightly by hour five, and that extra room is the difference between comfort and quiet agony. This look works for virtually any office, from law firms to startups, and the brown trousers photograph as more interesting than black while still being neutral. It’s an assistant uniform you can rely on when you can’t overthink.

Why Your Assistant Outfit Has to Work Twice as Hard

Hybrid demands: A standard office outfit assumes you’ll sit still. Your day involves bending to restock the supply closet, speed-walking across a campus to hand-deliver a signed document, then suddenly sitting in on a client call where you’re the first face they see. Clothes that can’t handle both stillness and motion will betray you within a hour. I’ve seen women adjust their blouses eighteen times before lunch—each tug signals discomfort, not authority.

Hidden friction: That crossbody bag you rely on for errands? It’s sanding the left hip of your polyester blouse with every step. By week three, the fabric pills into a texture that reads “worn” from across a desk. Most guides recommend stretch fabrics for comfort. I’d argue you need friction-resistant weaves first, because stretch won’t save a surface that’s been scrubbed raw by a strap.

Beyond fit: Even properly tailored pieces can gap or bind when you sit and stand twenty-plus times a day. The problem isn’t size—it’s the garment’s construction. A blazer with no back pleat forces the shoulders forward when you reach for a file; trousers without a gusseted crotch seam pull tight every time you rise. You end up fighting your clothing in microscopic ways that accumulate into visible fatigue by afternoon.

Psychological cost: When your outfit fails mid-task, the mental noise is immediate. You’re not thinking about the meeting agenda; you’re wondering if your shirt has come untucked while you carried a tray of coffees. The fix isn’t more expensive pieces—it’s hidden mobility: back pleats, two-way stretch woven into trousers, sleeves cut with a forward shoulder angle so you can type without the cuff hiking to your elbow. Look for these specifics when you shop, not just “professional.”

The Assistant’s Secret Code: Reading a Room Before You Dress

Unspoken hierarchies: Office dress codes for assistants are rarely written down. Your supervisor might wear jeans while the executive you support expects you in suit separates. The real rulebook is visual: watch what the office manager wears versus the department head. You need to land in the middle—polished enough to greet a board member, approachable enough that a colleague won’t hesitate to ask you where the toner is stored.

Competent adjacency, not mimicry: Dressing exactly like the senior team can backfire. If you mirror the finance director’s head-to-toe designer look, it can read as overstepping. The goal is a calibrated echo: similar formality level, but with pieces that signal you’re there to support, not compete. A knit blazer instead of a structured wool one; a dark trouser with a subtle crease, not a razor-sharp pleat. The distinction is small but registers subconsciously.

Availability signals: Your outfit silently communicates whether you’re open for quick questions. Too rigid—say, a starched poplin blouse buttoned to the throat—tells people you’re not to be interrupted. Too informal—a slouchy cardigan on a Tuesday—can read as “I’m checked out.” A soft collar and sleeves pushed to the elbow project warmth and competence simultaneously. Most guides ignore this nuance entirely. The better move is to treat your assistant wardrobe as a tool for managing how accessible you appear minute-to-minute.

Decoding the industry: A blazer in a law firm means worsted wool and structure. In a tech startup, the same word means a collarless knit jacket you’d almost wear on a weekend. The assistant bears the burden of translation because you sit at the intersection of visitors, executives, and vendors. Your first-week assignment isn’t to buy clothes—it’s to study three women whose roles you admire and note the materials and silhouettes they choose. Then edit, don’t copy.

What No One Tells You About Desk Life and Your Clothes

Seated stress patterns: Hours in a chair create garment failures that no mirror selfie catches. Panty lines deepen under office lights because the flesh settled differently when you sat. The crease that cuts across your right hip becomes permanent by month’s end, leaving a pale ghost line even when you’re standing. Front-button poplins gape when you lean forward to type, revealing a bra that you never planned to show. This isn’t a size issue—it’s that the fabric and cut weren’t built for the specific posture of desk work.

Waistband geography: Where your waistband hits while sitting is not where it hits while standing. A trouser that fits perfectly upright can dig into your stomach after two hours because your office chair tilts your pelvis. Some women experience a raw “seatbelt burn” from a stiff waistband rubbing with every chair swivel. The fix is a mid-rise with a back elastic insert or a flat-front elastic-back design that doesn’t look like a comfort pant but behaves like one. Test by sitting in a hard chair for ten minutes—if you feel pinching above your hipbone, pass.

Sound and silence: Linen-look blends seem like a smart summer choice until you realize they swish audibly every time you cross your legs. That noise is disproportionately distracting in an open-plan pod where the assistant is often the closest person to the visitor seating. And those cute ballet flats you love? They squeak on linoleum after a few wears. In a quiet office, a single squeaky step announces your trip to the printer louder than any email. Opt for rubber-soled shoes with a slight tread—silence is professional, especially at the front desk.

Static and seating: Synthetic skirts cling to tights the moment you stand up. The decent knee-length drape you had at 9 a.m. is a bunched mess by 11 because static built every time you shifted in your chair. A slip helps, but better is choosing linings that don’t fight your underlayer. Touch the inside of a skirt before buying; a silky polyester lining will generate less static than an unlined woven.

Assistant Wardrobe Budgeting That Actually Adds Up

The fast-fashion trap: The pressure to look expensive on an entry salary pushes many assistants toward haul shopping—six blouses for the price of one decent one. But those pieces warp after three washes, and the color fades along the front placket where you reach for the phone. You end up spending more per year replacing them than if you’d bought two quality shirts. The math is clear but the marketing wins every time. Break the cycle by calculating cost-per-wear: a $68 machine-washable shell you wear twice a week costs pennies per wear by month three. A $12 shirt that pills after eight wears is a $1.50 per wear liability.

The repetition reality: You’ll hear “outfit repeating is fine” in most articles. The better move is to acknowledge that being seen by the same core group of people every day makes true repetition feel risky, even if nobody comments. Build a capsule where pieces intermix so you’re not wearing the same exact combination twice in a week. Seven complete looks from twelve pieces: two trousers, three tops, one dress, one jacket, and a few layering shells. That rotation avoids the “I’m still in Monday’s outfit” feeling without requiring a walk-in closet.

Hidden maintenance costs: That “affordable” wool blazer that’s dry-clean-only? Add $12–15 per cleaning, three times a season, and it costs an extra $45 a year you didn’t budget for. Meanwhile, a machine-washable crepe blazer from the same price range requires zero extra dollars. Do this math before you swipe your card. Dry-clean-only pieces steal from your income silently. Reserve them for the two surprise client-facing pieces, not your everyday workhorses.

Base-layer economics: Skimping on invisible pieces wrecks visible outfits. Seamless undies in a shade close to your skin tone prevent the panty-line problem that ruins light trousers. A quality camisole with a lower neckline than your blouse stays hidden and stops gaping buttons. Spend where it disappears; that’s what keeps the rest of the outfit holding together from 9 to 5.

A budget that sticks: Allocate no more than 3% of your monthly take-home pay to clothing. For a $2,800 net monthly income, that’s $84. Track it in a notes app every single purchase—no guessing. Build your capsule with pieces that can be washed and dried on a rack overnight. The goal is twelve core items that require zero dry cleaning and two surprise pieces for big presentation days. That’s a full assistant wardrobe that costs less than one statement jacket you’d buy out of panic.

5 Items Every Assistant Needs in Her Desk for Outfit Emergencies

Stain-removing pen: Keep one that’s fragrance-free and works on coffee and ballpoint ink.

Test it on an inner seam the first time—some pens bleach synthetic blends, turning a small drip into a pale, obvious patch. A pen that leaves no wet residue also means you don’t have to wait for it to dry before heading into a meeting.

Fashion tape: Store double-sided tape in a neutral tone, not for hems but for blouse plackets.

When you lean forward to hand a file across a desk, the gap between buttons can reveal your bra. A strip of tape along the placket keeps everything flat without the crinkle of a safety pin. Just peel and press before a client-facing moment.

Roll-up ballet flats: A compact pair of matte black flats that fold into a pouch belong in your bottom drawer.

Heels break. A sole separates during an off-site errand, and you’re stuck walking barefoot across a parking lot. These roll so small you forget they exist—until the day you don’t have to limp back to your desk.

Travel de-piller: A battery-powered fabric shaver lives in your drawer, used once a week on the inner thighs of your trousers.

Fuzz builds up there from friction, and it cheapens even a $120 pair within a month. A quick pass while you’re on a call removes the pills that make fabric look tired, and the shaver costs less than a dry-cleaning run.

Spare no-show liner socks: Keep a fresh pair in a sealed snack bag.

When the air conditioning blasts and your feet turn clammy inside your loafers, switching to dry socks in the restroom resets your entire sense of composure. The bag keeps them from picking up drawer-dust, so they’re truly ready when you need them.

FAQ

Can I wear jeans in an assistant role?

Only dark indigo, trouser-cut jeans with a sharp center crease. Pair them with loafers and a structured blouse, and they read intentional—even inside business casual offices. Pale or distressed denim almost never passes as professional, even on Fridays.

How many outfits do I need for a five-day assistant work week?

Aim for seven full looks. Two trousers, three tops, one dress, and one jacket that intermix will carry you through a week and cover an unexpected late night without smelling stale. That count prevents the “I’m wearing my backup outfit” panic when something stains or rips.

What shoes are best for an assistant who is on her feet for half the day but still needs to look polished?

Block-heel loafers or low ankle boots with a 1.5–2 inch heel and a rubber sole. They balance standing on hard floors with sitting quietly under a desk, and they don’t click loudly enough to draw attention in a silent suite. I bought the comfortable shoes for this exact reason, and I don’t apologize for it.

How do I dress for an assistant interview when I don’t know the office culture?

Wear a dark, structured dress with sleeves and a trouser-cut silhouette. Add a simple necklace you can tuck inside if you sense the room is more casual—removing a blazer is easier than dressing up from a polo neck mid-interview. This interview outfit strategy leaves you looking competent without over- or under-shooting.

My office is freezing—what’s an assistant outfit solution that doesn’t look like I’m wearing a blanket?

A fine-gauge merino wool cardigan in a shade that matches your skin-tone undertone layers under blazers without bulk. It traps heat without adding visible insulation. Heated insoles in your work shoes can shift your body’s thermal focus so you don’t need a scarf wrapped up to your chin.

What undergarments prevent visible lines in light-colored assistant trousers?

Seamless laser-cut cotton-modal blend briefs in a shade one tone darker than your skin, not lighter. Light undies paradoxically create a highlighting effect under beige or white fabrics, while a deeper neutral blends into shadow and disappears. Always test by turning around in natural light before you leave the house.

Are open-toed shoes ever acceptable for an assistant?

Only if you are absolutely certain no client will walk in and no document will drop near your feet. A single incident with a heavy binder negates the summer permission. Most veteran assistants keep a pair of closed-toe block heels under their desk year-round, and you should too.