vest, waistcoat 辨析

Vest(n.)---“背心”,“马甲”。美国用语。
Waistcoat(n.)---“背心”,“马甲”。英国用语。也用于英国的商业。

例:He takes off his coat to reveal a bright red vest.
他脱下上衣，露出一件鲜红的马甲。
Jimmy is wearing a vest under a coat.
吉米在上装里面穿着一件背心。
The sleeves of a pale blue waistcoat came only to her elbows.
一件淡蓝色马甲的袖子只垂到了她的臂弯处。
He left off his waistcoat as soon as he came into the room.
他一进屋就脱掉了他的马甲。