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 worn over a white dress shirt with a starched or pique 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 complete the outfit. Orders, decorations and medals 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.

Formal wear or full dress is the Western dress code category applicable for the most formal occasions, such as weddings, christenings, confirmations, funerals, Easter and Christmas traditions, in addition to certain state dinners, audiences, balls, and horse racing events. Generally permitted other alternatives, though, are the most formal versions of ceremonial dresses, full dress uniforms, religious clothing, national costumes, and most rarely frock coats. In addition, formal wear is often instructed to be worn with official full size orders and medals.