Not exactly the way I said it, but mainly yes.
Pupose? Besides feeling better and not being cold when it is cold (Which I think Is a fine advantage) and besides the fact that you can use it to have more LDs (Without it, you won’t be able to ressist cold; therfore, you won’t have the option wether you want to wear more clothes or not, but rather you will have to), I do belive it can help with keeping in shape, although I haven’t checked it.
I used the wrong word. What I mean by “excess”, is any clothes beyond a pair of trousers and a t-shirt (not including underwear)