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 is 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.