A suit is a set of men's or women's clothes comprising a suit jacket, or coat, and trousers. When of identical textile, and worn with a collared dress shirt, necktie, and dress shoes, it was traditionally considered informal wear in Western dress codes. The lounge suit originated in 19th-century Britain as more casual wear alternative for sportswear and British country clothing. After replacing the black frock coat in the early 20th century as regular daywear, a sober one-coloured suit became known as a lounge suit. A darker, understated lounge suit for professional occasions became known as a business suit.
