A suit is a set of men's wear comprising a lounge jacket 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 as 19th-century casual sports and country wear in Britain, still reflected in the sport coat and blazer worn as smart casual. After replacing the black frock coat in the early 20th century, a darker suit also became known as a business suit for professional occasions, when sober in style.
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