cum·mer·bund
noun/ˈkʌməbʌnd/
/ˈkʌmərbʌnd/
- a wide band of silk, etc. worn around the middle part of the body, especially under a dinner jacket
（尤指男式晚礼服的）宽腰带 Word Originearly 17th cent.: from Urdu and Persian kamar-band, from kamar ‘waist, loins’ and -bandi ‘band’. The sash was formerly worn in the Indian subcontinent by domestic workers and low-status office workers.