A cummerbund (Persian: کمربند kamarband) is a broad waist sash, usually pleated, which is often worn with single-breasted dinner jackets (or tuxedos). The cummerbund is an Asian-origin garment which was first adopted by British military officers in colonial India when they were exposed to Indian men wearing it. It was adopted as an alternative to a waistcoat, and later spread to civilian use. The modern use of the cummerbund to Europeans is as a component of a traditional black tie event.
The word cummerband, कमरबंद in Hindi, is the name commonly used in the South and West Asia including India. It entered English vocabulary in 1616 from India. It is a combination of the Persian words کمر {kamar} meaning 'waist' and بند {band} meaning 'strap' or 'lacing'. The kamarband, literally meaning 'waist-band', was a sash accessory worn by Indian men for many occasions. (Before the British colonial presence, Persian was one of the court languages in India, hence the Persian influence.)
The word cummerband (see below), and less commonly the German spelling Kummerbund (a phonetic translation of the English word), are often used synonymously with cummerbund in English. Today, the word kamarband in Persian refers to anything which is or works like a belt, be it a clothing belt, a safety belt or a ring road around a city center(کمربندی).
The form of the cummerbund is a wide band around the waist, and its origin as part of black tie determined the acceptable colours. Once it was adopted as civilian dress, beginning as a largely summer option with informal dinner jackets, such as Burmese fawn and white, it was restricted to the narrow range of colours which accompany black tie. These were predominantly black, sometimes midnight blue to match the trousers, and occasionally maroon (the normal hue for coloured accessories). The pleats face up because they were originally used to hold ticket stubs and similar items, explaining the slang name 'crumb-catcher'. However, the cummerbunds worn as part of the US Army Blue Mess and Blue Evening Mess uniforms are worn with the pleats down, as prescribed by Army Regulation 670–1 Chapter 24 Section 10(b). The contemporary use of the cummerbund is purely aesthetic, providing a transition between the shirt and the waistband. The fastening is a ribbon around the back, tied or held shut by a buckle or velcro.