What to wear to a wedding as a guest (and how to check it on yourself first)

Wedding-guest dressing has a fixed deadline, an audience, a photographer and rules nobody prints on the invitation, which makes it the occasion people most often buy for in a panic and return in disappointment. The rules are not complicated, just scattered. Here they are in one place, followed by the part that has changed: you can see the candidates on your own body before buying any of them.

Dress codes, decoded

Every code is a level of formality plus a fabric register, and both matter. A silk slip and a cotton sundress can be the same shape and belong to different weddings.

When the invitation says nothing, the venue and the hour are the code: an evening in a hotel ballroom is cocktail at minimum, a Saturday afternoon in a barn is garden, a registry office and a pub is casual. The earlier piece on weddings, interviews and dates has the principle: read the code literally, then go one notch up, because overdressed is invisible and underdressed is remembered.

What 'no white' actually covers

Everyone knows not to wear white. Fewer people know how wide the exclusion is, or why. The rule exists because of photographs: a colour that reads as cream or blush in daylight can read as white in a flash-lit group shot, and the group shot is the one that ends up on a wall.

• White, ivory, cream, off-white, champagne, oyster, ecru. All white in a photograph. Skip them without exception.
• Very pale pink, nude and pale silver. If it could be mistaken for white from across a lawn, it will be.
• White-dominant prints. A dark floral on a white ground is mostly white at a distance. A white floral on a dark ground is fine.
• Head-to-toe pale for men. A cream linen suit at a beach wedding is a judgement call; a white one is not.
• Whatever the couple has asked for. Some couples request a colour or ask everyone to wear white. The invitation overrides every rule on this page.

Picks by dress code: women

By silhouette and fabric rather than product, because the product changes every season and the silhouette does not.

• Black tie. A column or bias-cut gown in satin or crepe, or a structured A-line in a heavier fabric. If the fabric shines, keep the jewellery quiet.
• Cocktail. A midi with structure at the waist in crepe, satin or heavy jersey, or a tailored trouser suit in a saturated colour, which is fully accepted now and photographs well.
• Semi-formal. A midi with movement, a wrap dress, or a silk blouse with a wide-leg trouser. The wrap dress is the most forgiving garment for four hours of sitting and standing.
• Garden. A tiered or A-line midi or maxi in cotton voile, viscose or lightweight silk. A block heel or flat sandal; a stiletto on grass is an accident waiting to happen.
• Beach. A long slip or tiered maxi in linen, cotton or breathable viscose, in a colour that is not white. Nothing that needs shapewear in heat.
• Casual. A knee-length day dress with sleeves, or a skirt and a good blouse. Fabric with body over fabric that clings.

Sit down in it before you commit, and check the back, since half the photographs are taken from behind during the ceremony. Brands built around this category, such as Reformation and Ganni, cut for a particular proportion, and the same dress lands mid-calf on one person and at the ankle on another. Only your own body answers that.

Picks by dress code: men

• Black tie. A black or midnight-blue tuxedo, white dress shirt, black bow tie, black polished shoes. Rent before you buy badly.
• Black tie optional. A dark navy or charcoal suit in smooth wool, white shirt, dark tie, black shoes. It will look right beside a tuxedo.
• Cocktail. A navy, charcoal or deep-green wool suit, a plain shirt, a silk or knit tie, dark leather shoes. The outfit that covers the most weddings.
• Semi-formal. A suit without a tie, or a navy jacket with a grey or stone trouser and an open collar that holds its shape. Loafers.
• Garden. A lighter suit in linen, cotton or fresco wool, in stone, tan, sage or mid-blue, half-lined so it does not cling. Suede shoes or loafers.
• Beach. Linen trousers and a linen shirt, an unstructured jacket for the ceremony if you like, no tie, loafers.
• Casual. Chinos or smart trousers, a collared shirt, a knit or unstructured jacket, clean leather shoes. No denim unless the invitation says so.

Fit matters more than fabric. A suit that is right across the shoulder reads as expensive whatever it cost, and one a size out reads as borrowed. High-street tailoring from Mango and J.Crew is cut narrowly enough through the shoulder to be worth checking on yourself; both brand pages carry the sizing notes.

Adjust for the venue and the hour

Grass, gravel, cobbles and sand rule out thin heels, so if the venue is outdoors decide the shoe first and choose the hem to match. It will be colder at 10pm than the code implied and the day is eight hours long, so a jacket or wrap that matches is part of the outfit. Many places of worship expect shoulders and knees covered; a layer you can remove afterwards solves it. And solid, saturated colours photograph best, while tiny prints and very shiny fabrics can strobe under flash.

Check the candidates on yourself before you buy

The traditional wedding-guest purchase is three dresses ordered in a hurry, two returned, and the third worn with some regret. The alternative takes ten minutes. Take one full-length photo of yourself against a plain wall in even light, arms slightly away from your sides, build a fit model in Utopia, and put your two or three candidates on it, one after another.

What the try-on settles: where the hem lands on your height, whether the neckline works with your proportions, whether a colour reads well against your skin, whether a full skirt looks celebratory or swamping, whether a suit's shoulder is credible. None of that can be read from the product photograph, which shows the garment on someone chosen because the sample fitted them.

What it will not settle is the size. Pick the shape from the try-on, take the number from the size chart, and read the returns policy before you order, because occasion wear is often final sale and delivery windows do not care about the date on the invitation. The buying guide lays out the sequence, including how to paste a link for a dress from a store not in the catalogue. If you are dressing a partner too, add them as a second person; two outfits that work alone can clash in the same frame.

Try three outfits on yourself tonight. Order one tomorrow, and turn up on the day certain.

Get the app