OK, How about Dry Suits?

[matt t.]

A "regular" neoprene suit shouldn't need a serious undergarment. Any shell type suit or "crushed" neoprene suit will need a serious undergarment. If you look around a little bit and do some shopping, DUI suits aren't as expensive as everyone thinks. Their "list" prices can be crazy, but who pays MSRP for their car? Bare and Diving Concepts offer the best value for a name brand suit. If you don't care about names and are shopping based on cost alone check out E-bay, the GUE used gear page, The Deco Stop for sale forum, and the Cavediver.net for sale forum. There are a lot of decent deals out there if you know what you are looking for.