Good discussion. I am a pretty passionate Under Armour guy, and haven't found their stuff to be too constricting. For me, the sleeveless compression heat gear helps keep my back warm all year. In the fall the cold gear is truly toasty and like a second skin.
All this said, if someone really spent time developing a "golf specific" line of items, I'd be all over them. Heck, it was only in the low 60's here in Michigan this weekend, so I'll be using more gear soon. Dang!