A man’s three-piece suit includes a jacket,trousers,and a waistcoat.是什么意思？

A man’s three-piece suit includes a jacket,trousers,and a waistcoat.

男人的三件套服装包括上衣、长裤和背心。

suit

n. 一套外衣，西装，套装，诉讼，恳求；vt. 适合于（某人），尤指服装、颜色等相配，合身，适宜；vi. 合适，相称；

例句
...a shimmering suit of aquamarine satin.
海蓝色缎子做的华贵套装

includes

v. 包括( include的第三人称单数 )，包含，列入，包住；

例句
The show includes canvases by masters like Carpaccio, Canaletto and Guardi.
画展上有卡尔帕乔、卡纳莱托和瓜尔迪等大师们的油画作品。

jacket

n. 短上衣，夹克，土豆皮，书籍的护封，文件套，公文夹；vt. 给…穿夹克，给…装护套，给…包上护封，〈口〉打；

例句
I saw a man in a blue jacket thirty metres ahead of me...
我看见在我前面30米处有一个身穿蓝色夹克的男人。

trousers

n. 裤子；

例句
It makes soldiers happy to know that somebody right at the top has been caught with his trousers down...
顶头上司出了大洋相，当兵的最高兴了。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

waistcoat

n. 马甲，背心；

例句
Long gown, mandarin jacket and waistcoat were the typical Manchurian clothes.
长袍 、 马褂、马甲为满族人的主要服装.