Formal wear (Canada, US) and formal dress (UK) are general terms for clothing suitable for formal social events, such as a wedding, formal garden party or dinner, débutante cotillion, dance, or race. The Western style of formal evening dress, characterised by black and white garments, has spread through many countries; it is almost always the standard formal social dress in countries without a formal national costume.

Formal wear (Canada, US) and formal dress (UK) are general terms for clothing suitable for formal social events, such as a wedding, formal garden party or dinner, débutante cotillion, dance, or race. The Western style of formal evening dress, characterised by black and white garments, has spread through many countries; it is almost always the standard formal social dress in countries without a formal national costume.