Fursuiting Undergarments

OK, I wanted to get me something new to wear under my suit as the spandex thing I was using before was quite frankly crap and needs to be thrown away. I don't really want to have to buy another chinese spandex thing off eBay unless I really have to. I'd probably look to separating it into a t-shirt and trousers if I did but I'd rather explore whatever other options there are which aren't just wearing a t-shirt & shorts under the suit.

I was considering getting the Under Armour Heatgear as that's what a number of other furries seem to have opted for. However I'm not exactly of athletic proportions and so they don't seem to do stuff which would fit a... "larger" gentleman. So, I was curious to know what other people tend to wear under their fursuits so they don't get all soggy and uncomfortable.