I didn't want to start a new discussion pro/con neoprene drysuits. There are no doubts experienced divers will benefit from the advantages of a constant volume suit. A neoprene drysuit is actually easier to learn to dive with, according to our dive centres experiences over here, so it's the most common school suits, including my ten complete outfits. Note that 95% of all OWD-classes are held with drysuits over here though. -And with only 6 open water dives during a course, time is a limited asset in this aspect.
But the thread is about undergarnments, and my wish was to point out that what you wear underneat depends on your type of drysuit. It's a bit "arrogant" to presume everyone uses trilams
Anyways, I am just amazed how impressed you guys in the US are with synthetics. Why? It stinks after a few hours use. It DOESN'T insulate anywhere near wool. It DOESN'T insultate at all when wet. Take this from an experienced Norwegian folks. Up here we don't just survive the winter. -We LIVE in it!