Definitions for the Clothing & Textile Industry
A cummerbund is a broad waist sash, usually pleated, which is often worn with black tie. The cummerbund was first adopted by British military officers in colonial India and later spread to civilian use.
It should be worn with the pleats facing up to hold ticket stubs (e.g., coat check, theater tickets, etc...)
Cummerbund is also an informal word used
SCUBA to mean a wide waistband on a diving stability