1. The man was wearing a black waistcoat.
    这个男人穿著一件黑色背心。

1. 背心：男性西服最为规范化.长袖外套,相配的长裤,长袖衬衫,领带,是男性套装的基本服饰.外套配长裤称为两件式西装(two-piece suit加上背心(waistcoat)则称为三件式(three-piece suit).女性西服则比较多样化,不过基本可归纳为外套,

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2. 马甲：在十九世纪的欧洲,艺术家与作家会过着波希米亚式生活|波希米亚式的生活,并且刻意穿着某些服装来震惊他人:乔治.桑(George Sand)穿着男性的服装、女性解放运动者穿着短灯笼裤(bloomers)、男性艺术家穿着丝绒马甲(waistcoat)与俗丽的领巾.

3. 背心,马甲：suits 套装 | waistcoat 背心,马甲 | tank top 女用背心

4. 西裝背心：西裝;西服 Western-style clothes | 西裝背心 waistcoat | 夾衣 lined dress

1. 背心;马甲
    A waistcoat is a sleeveless piece of clothing with buttons which people usually wear over a shirt.

1. a man''s sleeveless garment worn underneath a coat

    Synonym: vest