Justin,
I sweat a lot and am almost always wet, rain or not. With or without raincoat (breathable or not)my primary concern is staying warm. The insulating value of my clothing is significantly reduced when it is soaking wet.
So my garment of choice is a closed cell foam float coat like boaters use. It serves as both an insulating garment and a raincoat and is also part of my sleeping pad system. The closed cell foam's insulating value isn't much affected by the wetness.
Daryl

