A suit, lounge suit, or business suit is a set of clothes comprising a suit jacket and trousers of identical textiles worn with a collared dress shirt, necktie, and dress shoes. It is considered informal wear in Western dress codes. The lounge suit originated in 19th-century Britain as a more casual alternative for sportswear and British country clothing, with roots in early modern Western Europe. After replacing the black frock coat in the early 20th century as regular daywear, a sober one-colored suit became known as a lounge suit.
Suits are offered in different designs and constructions. Cut and cloth, whether two- or three-piece, single- or double-breasted, vary, in addition to various accessories. A two-piece suit has a jacket and trousers; a three-piece suit adds a waistcoat. Hats were almost always worn outdoors (and sometimes indoors) with all men's clothes until the counterculture of the 1960s in Western culture. Informal suits have been traditionally worn with a fedora, a trilby, or a flat cap. Other accessories include handkerchief, suspenders or belt, watch, and jewelry.
Other notable types of suits are for semi-formal occasions—the dinner suit (black tie) and the black lounge suit (stroller)—both which arose as less formal alternatives for the formal wear of the dress coat for white tie, and the morning coat with formal trousers for morning dress, respectively.
Originally, suits were always tailor-made from the client's selected cloth. These are now known as bespoke suits, custom-made to measurements, taste, and style preferences. Since the 1960s, most suits are mass-produced ready-to-wear garments. Currently, suits are offered in roughly four ways:
bespoke, in which the garment is custom-made by a tailor from a pattern created entirely from the customer's measurements, giving the best fit and free choice of fabric;
made to measure, in which a pre-made pattern is modified to fit the customer, and a limited selection of options and fabrics is available;
ready-to-wear, off-the-peg (Commonwealth English), or off-the-rack (American English), which is sold as is, although some tailor alteration tends to be required;
suit separates, where lounge jacket and trousers are sold separately in order to minimize alterations needed, including also odd-colored blazers or sports coats as smart casual options
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