This is very casual, a sweat suit.

运动服很休闲。

Whereas a sweat suit is designed to keep you warm and this is very informal.

而运动服是为了保暖而设计的，这是非常不正式的。

And a sweat suit is a matching pair of sweat pants and sweat shirt, right.

运动服是配套的运动裤和运动衫，对吧？

If you're going to work, unless you're the boss, you're not going to wear a sweat suit to work.

如果你要去工作，除非你是老板，否则你不会穿运动服去上班。

Every time when I come home from work, I put on my sweat suit and just relax on the couch.

每次我下班回家，我都会穿上运动服，在沙发上放松。

See there, the old guy in the stained sweat suit.

瞧 Look...是一个穿着脏兮兮运动服的老阿伯。

Old guy. Rocks the hell out of a stained sweat suit.

一个老家伙 穿脏兮兮的运动服有型到炸。

But business suit, track suit, sweat suit, it's usually when you have two pieces that go well together that match, that are one part of an outfit, right.

但是西装、动服、运动服，通常是指两件搭配得很好的衣服，那是服装的一部分？