The dress codes, from most to least formal
White tie
The rarest and most formal. Women: full-length ball gowns, long gloves optional. Men: black tailcoat, white bow tie, white waistcoat. If you see this code, it is a grand evening affair — dress accordingly.
Black tie
Women: floor-length gowns or dressy cocktail dresses. Men: tuxedo with bow tie. The classic evening-wedding code.
Black tie optional / Formal
Women: long dresses or elevated cocktail dresses. Men: tuxedo preferred, dark suit acceptable. When in doubt at this level, lean formal.
Cocktail
Women: knee-to-midi cocktail dresses or dressy separates. Men: suit and tie. The default for most evening weddings.
Semi-formal / Dressy casual
Women: sundresses, midi skirts, polished separates. Men: blazer or sport coat with trousers; tie optional. The most flexible code — neat and celebratory beats trendy.
Casual
Women: summer dresses, nice separates. Men: chinos and a collared shirt. Still a wedding: skip shorts, tank tops, and flip-flops.
Beach / Destination formal
Lightweight, wind-friendly fabrics; sandals over heels; linen suits without ties. Formality comes from polish, not weight.
The unwritten rules behind the codes
Dress codes describe a range, and guests are expected to land inside it — not at its edges. A cocktail dress code tolerates both a simple sheath and a beaded midi, but not a ballgown and not jeans. Time of day matters too: the same "semi-formal" reads dressier at 7 p.m. than at 2 p.m. And cultural or religious venues may add requirements — covered shoulders, head coverings — that outrank the printed code, so check the venue as well as the invitation.
These wedding codes are part of the wider invitation ladder. Dress Codes Explained walks every code from white tie to smart casual, with full guides to the two codes wedding guests meet most often: cocktail attire and black tie attire.