Dress Codes Explained, from Casual to White Tie
What each invitation code asks you to wear, in order of formality.
Ten dress codes run from casual to white tie, and each tells you how dressed up to be. From least to most formal: casual; dressy casual, which invitations also call casual chic and which shares its level with smart casual; business casual; business formal; semi-formal; cocktail; black-tie optional; black tie; and white tie. Two pairs overlap. No source ranks casual chic against smart casual, and cocktail is, in Lizzie Post's 2022 words, 'a subset' of semi-formal. When the card leaves you unsure, dress up: Debrett's says it's 'preferable to look over-, rather than under-dressed'.
Printed dress codes are newer than the etiquette they encode. In the first edition of Etiquette (1922), Emily Post read the outfit from how the invitation was worded: full dress went with 'a dinner to which the invitations are worded in the third person'. Her advice for the unsure was the opposite of today's: 'err on the side of informality.' A century on, the Emily Post Institute tells you to err toward formality for anything after 6 p.m., and Debrett's calls a stated code 'an invaluable social signal, designed to protect guests from the embarrassment of turning up at an event underdressed, overdressed or in entirely inappropriate clothes.' The codes themselves have drifted too. Only a couple of generations ago, Debrett's notes, 'white tie was standard evening dress and black tie was considered informal.'
When the card is vague, dress one step up. A jacket comes off faster than one appears.
The dress codes, from casual to white tie
- 01Casual
Clean, comfortable clothes: Emily Post's guide lists khakis or nice jeans with a plain T-shirt (no slogans), polo or turtleneck. As the Associated Press's 2022 rundown with the Posts put it, 'Casual doesn't mean unkempt.'
- 02
One dressy piece with one casual one. Emily Post calls it 'a versatile balance between formal and casual', meant for after-work drinks, fundraisers or a nice restaurant; in 2022 the Posts allowed dress pants with a casual top, or casual pants with a dress top.
- 03
Debrett's called it 'by far the most common of all dress codes' in 2023: a jacket or a silk shirt, no sportswear, no beachwear. It shares the level between casual and business casual with dressy casual, and Emily Post's guide has no entry for it.
- 04
The American office code. Emily Post's guide: 'slacks, khakis, or a skirt with a dress shirt, blouse or polo', with dresses and seasonal sport coats allowed. Your company's own code overrides it.
- 05Business formal
A matched suit with trousers or a skirt. Emily Post: 'The darker the suit, the more formal.' British invitations call it 'lounge suits', which Debrett's says means ordinary business suits.
- 06
Dressier than the office, a little less than formal, in Emily Post's definition, and more formal still after 6 p.m. A short cocktail dress, a little black dress or dressy separates; for men, a dark suit and tie.
- 07
Lizzie Post called it 'a subset' of semi-formal in 2022, so the two overlap, and Zola notes guests rank them both ways. Debrett's says hosts choose it when they want effort without imposing black tie. 'Festive' is cocktail with a holiday touch.
- 08
Emily Post: men are asked to wear a tuxedo 'but can opt for a dark suit', and women choose 'a formal evening gown, a shorter cocktail dress, or dressy separates.'
- 09
'The most common formal dress code' for weddings, proms, formal dinners and the theatre, says Emily Post. A tuxedo for men; a floor-length gown or a dressy cocktail dress for women. Creative black tie keeps that base and adds flair.
- 10White tie
Also called full evening dress, it's 'the most formal of all dress codes' in Emily Post's guide. Debrett's calls it the rarest, announced on an elaborate invitation several weeks ahead.
Frequently asked questions
From least to most formal: casual, dressy casual (or casual chic), smart casual, business casual, business formal, semi-formal, cocktail, black-tie optional, black tie and white tie. Two overlaps matter. Magazines use casual chic for both dressy casual and smart casual, and no source ranks those two against each other, so treat them as one level between casual and business casual. Cocktail is 'a subset' of semi-formal, as Lizzie Post of the Emily Post Institute put it in 2022, so the two overlap rather than stack.
White tie. Emily Post's attire guide calls it 'the most formal of all dress codes', also known as full evening dress, and Debrett's describes it as the rarest, announced on an elaborate invitation several weeks before the event. Black tie sits one step below it and is far more common.
Read the invitation and the hour. For a wedding, Emily Post says 'the wedding invitation and the time of the wedding will be your best guide to its formality.' For a drinks party, Debrett's (2024) says most guests 'will default to smart casual clothing'. An engraved card and an evening start both point dressier; an email for a daytime party points more relaxed.
Overdressed. Debrett's (2023) says 'it's preferable to look over-, rather than under-dressed', and Emily Post's guide says to err on the side of formality for events after 6 p.m. A jacket or a wrap is easier to take off than to conjure at the door.
Very little. The Emily Post Institute treats cocktail as part of semi-formal: Lizzie Post told the Associated Press in 2022 that 'cocktail attire is a subset' of semiformal. Both mean a cocktail dress, a little black dress or dressy separates, and a dark suit for men. Zola's guide notes that guests rank the two both ways, so read the venue and the hour to settle it.
In the lower right corner of the reception invitation, and only if needed. Emily Post's guidance: 'If necessary, "Black tie" may be written in the lower right on a reception invitation.' Zola's 2024 guide suggests adding a line on the wedding website too, such as 'Dress as you would to a company cocktail party.'
Ask, and don't opt out. Debrett's (2025) says a confusing code is no reason to arrive in jeans and trainers, because 'a refusal to comply looks rude and contemptuous'. Its advice: consult fellow guests or ask the host to clarify.
Sources
- The Emily Post Institute — Attire Guide: Dress Codes from Casual to White Tie — accessed 2026-10-26
- Emily Post — Etiquette in Society, in Business, in Politics and at Home (Funk & Wagnalls, 1922), Project Gutenberg eBook #14314 — accessed 2026-11-04
- The Emily Post Institute — Wedding Guest Attire — accessed 2026-11-04
- The Emily Post Institute — Our Guide to Formal Wedding Invitations — accessed 2026-11-04
- Debrett's — Do Dress Codes Matter? (11 October 2022) — accessed 2026-11-04
- Debrett's — Deconstructing Dress Codes (6 December 2023) — accessed 2026-11-04
- Debrett's — Interpreting Invitations (18 November 2024) — accessed 2026-11-04
- Debrett's — Addressing the Dress Code (30 January 2025) — accessed 2026-11-04
- Associated Press (Leanne Italie), via KPRC Click2Houston — Parties are back, but how to dress? A holiday guide (26 December 2022) — accessed 2026-11-04
- Zola (Monica Mercuri) — Cocktail Wedding Attire Guide (updated 5 February 2024) — accessed 2026-11-04
- PaperCity (Shelby Hodge) — A Real Guide to Society Party Dress Codes (5 January 2017) — accessed 2026-11-04
- Washingtonian (Karina Giglio) — Decoding the Dress Code For Any Occasion (9 March 2015) — accessed 2026-11-04
- Indeed — business-casual attire and workplace differences — accessed 2026-10-14
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