Playing in Madrid (Spain) these days at 35F I've found that the best thing to do, not only warm keeping wise but also in terms of swing freedom, is following pretty much the strategy suggested by Galvin Green web
http://www.galvingre...er_concept.html
scroll down and see "dress for the weather" section
It doesn't matter if you go with its line or with other brand, provided it delivers the same levels of quality
In my particular case, this is what I'm mostly wearing
* a thermal baselayer. I use to go with UA and I do prefer the ones with the high collar
* a intermediate warm layer consisting of a fitted, soft, light pullover. I'm absolutely delighted with the Insula technology ones by Galvin Green, but the Men's Flux Power Stretch 1/4 Zip Pullover Fleece (Summit Series by The North Face) can do it pretty well (to be picky, this runs a bit long to fit perfectly with the swing). I always choose the 1/4 zip style, easier to put on/take off than the non-zip ones, and more comfortable than the full zip ones.
* an outer layer of goretex windstopper. If it is over 40F I like the short sleeve ones with lighter fabrics, Paclite Shell like; right now I couldn't live without my Berkley from Galvin Green. If temps drop below 40F I go to a long sleeve one, and more of a Performance Shell; I'm using a Baxley from Galvin Green and fits perfectly the bill. Again I tend to prefer the 1/4 zip style.
* a beanie, I've been using one from Trango (don't know if this brand is known in the States) till I lost it, now I have a Mizuno one and works well. I really don't think there is much of a difference in this point
* I am a long-term die-hard user of the UA coldgear golf pant. I have had the original one and the 2.0 and couldn't be happier. I think they don't do this model anymore, just hope the new element storm pant is as good as the old one