Cummerbund

A cummerbund (sometimes spelled cumberbund) is a broad waist sash, usually pleated, which is often worn with single-breasted dinner jackets (or tuxedos). The cummerbund was first adopted by British military officers in colonial India as an alternative to a waistcoat, and later spread to civilian use. The modern use of the cummerbund is as a component of black tie.