It takes a skeleton in a body to fill out a suit of clothes.
Personally, I just call it my suit. A pair of suit pants goes with a suit. A suit jacket goes on top, with a suit. Then there's the vest and the chains. You put on a pair of nice shoes and you're fully dressed, assuming there's a shirt in there somewhere. And a tie.
Without the jacket it's just a pair of pants, and without the pants it's just a jacket. The suit takes the whole thing to be the suit.
I have a couple of suits. More than that if you include the bad ones. Why I have bad ones? I haven't gotten around to selling them to the rag man yet.