White tie, also called full evening dress or a dress suit, is the most formal evening Western dress code. For men, it consists of a black tail coat (alternatively referred to as a dress coat, usually by tailors) worn over a white dress shirt with a starched or piqué bib, white piqué waistcoat and the white bow tie worn around a standing wing collar. Mid or high-waisted black trousers with galon, a braid of trim consisting of two silk stripes to conceal the outer seams of the trousers, along with court shoes (British English) (pumps in American English) complete the outfit. Orders, decorations and medals in miniature may be worn. Acceptable accessories include a black top hat, white gloves, a white scarf, a pocket watch, a white pocket square, and a boutonnière. Women wear full-length ball or evening gowns with evening gloves and, optionally, tiaras, jewellery, and a small handbag.
The dress code's origins can be traced back to the end of the 18th century. New fully black-coloured justaucorps styles emerged around the Age of Revolution, notably adopted by the bourgeois third estate of the Estates General of the Kingdom of France. Increasingly following the French Revolution, high society men abandoned the richly decorated justaucorps coats for more austere cutaway dress coats in dark colours, with cuts perhaps further inspired by the frocks and riding coats of country gentlemen. Gradually replacing also breeches, lacy dress shirts and jabots with plain white dress shirts, shorter waistcoats, white cravats and pantaloons, this became known as directoire style. By the early 19th-century Regency era, dark dress tailcoats with light trousers became standard daywear, while black and white became the standard colours for evening wear. Although the directoire style was replaced for daytime by black frock coats and bowties by mid-19th century, cutaway black dress tailcoats with white bowtie has remained established for formal evening wear ever since.