Just got a Bare CD4 Drysuit, and Will be diving in it soon...however before I go and subject myself to the icy cold frozen waters I need some advice on undergarments. I find myself to be in the middle as far as cold tolerance. Any suggestions from those that have this suit for someone looking to go ice diving? I was told a 100g would work, but seeing as how I used a 350g on my DUI TLS 350 when it was working in 40F waters..this doesn't seem quite right. Thanks!