What do you wear under your dry suit?
I thought I'd take a pole- what does everyone wear under their drysuits in the cold? I love my IR Union Suit, though when I'm paddling and it's cold (below 40 F and possibly snowing for example), I'm not quite warm enough. It's always seemed a bit thin. If I throw on separate tops/bottoms, I find I get particularly cold at my waist after a couple of hours as they move around. Too much insulation and movement is restricted.
So, what are everyone's preference for when it's below 40 F degrees and paddling whitewater?