British EnglishBrEDCC a piece of clothing without sleeves that has buttons down the front and is worn over a shirt, often under a jacket as part of a man’s suit 马甲,西服背心SYN American English vest
Examples from the Corpus
waistcoat• Pinstripe jacket down from £69.99 to £34.95, trousersreduced from £34.95 to £19.95, waistcoats from £29.99 to £19.95.• Judi was coming apart inside her waistcoat.• His fingersflipped open the buttons of his waistcoat.• He took his gold watch out of his waistcoatpocket and snapped it open.• His breeches were made of white shinysilk and so was his waistcoat.• Her tears had dampened his immaculatewaistcoat.• We could see the birds in their dark-stripped waistcoats.