waistcoat

The groom wore a silk waistcoat under his tuxedo for the formal wedding.

(Chinese) 新郎在正式婚礼上，在燕尾服里穿了一件丝制马甲。

Victorian gentlemen often kept their pocket watches in a small pocket on their waistcoat.

(Chinese) 维多利亚时代的绅士常把怀表放在马甲的一个小口袋里。