I mix it up generally. Trusty Patagonia r1 hoody on top or silkweight capilene and smartwool/icebreaker/Patagonia wool bottoms.
And my wish list for underwear. I wish the umm crotch region on leg underwear used a lighter fabric than the rest of thermal. Give my man bits a bit of a breather
I see lighter fabrics used on some garments on the underarms...why not the crotch area.