Quick question, I'm looking for a suit too and alot of the new ones advertise 3/2 (as flexible as 2/1). I'm sure you have to try it to believe it..
in anycase, the temps everyone is referring to..are these air or water temps? Or do you assume somewhere between both?
I'm guessing our lake is about 42-50F at the beginning of May, but the air can range wildly depending on wind and other weather factors. I won't use a suit from June-Sept. Would I still need a 3/2 considering those water temps?
Well after all the great advice I went online and did some research and ended up buying a O'Neil 3/2 suit off wetsuitwarehouse.com, they had pretty competitive prices and a very large selection.
Depending on brand, I would suggest you look for an XXL in Tall. That should be nice and loose on you, and since you won't be submerged much, should keep you dry while riding and not be too tight.
But, this depends on brand, so always try one one first. Feel free to test them out at the surf or dive shop, then buy similar brand/size online.
If it feels tight in the dressing room, go the next size up. If tight in the crotch or shoulders (pulling you down), go a size taller, and if tight in the belly, go a size bigger (L, to XL, to XXL).
It is always better to have one a size too big rather than a size too small.