What is a "cummerbund"?

A cummerbund is a wide sash made of silk or satin fabric that is worn around the waist, usually with a tuxedo or formal attire. It is a broad band of cloth that is pleated in the center and has a buckle or fastening in the back. The cummerbund is a traditional component of black tie attire, and it is typically worn with a matching bow tie. The cummerbund was first introduced in India during the British colonial period and later became popular in Europe and the United States as a part of formal wear for men. Its original purpose was to prevent sweat from staining formal wear, but it has now become a stylish accessory for formal occasions.