ORIGINAL: Germ
Get some good cold gear, spend the $ it's worth it.
A good vest will do wonders, keep your core warm and the rest will be fine.
Under Armour gets some slack from folks who NEVER use it. I bought some and it is great. I hunted all day in 25 degree weather, with sleet, rain, wind and snow. I was fine!!!
I admit to being one of those people...I now own like 8 pieces of UA. My next purchase will either be the fleece vest from Predator or a brown UA fleece vest..I agree, keep you core warm and you can go sleeveless just fine...ok maybe not, but bulky layers on the arms is not neccessary.