Cummerbund (noun)

1. A wide waistband worn with a tuxedo or formal evening wear as a substitute for a vest.
2. A type of sash or waistband worn with traditional men's clothing in South Asia and Central Asia.

Origin:

From persian kamarband, meaning "waistband".

Examples:

1. He wore a black cummerbund with his tuxedo.
2. The cummerbund is a traditional accessory for men's formal wear.
3. A cummerbund is a waistband worn with tuxedos and formal evening wear.
4. The groom wore a red silk cummerbund with his traditional Sherwani.
5. Cummerbunds are often worn with a bow tie to complete the formal look.