X2 on the good foot wear, must have! Ploy-pro liner socks and outer socks with high percentage of wool. Get several pairs of wool army gloves from the army surplus store. Several pairs cause they're cheap and you'll loose them, least I do . Then get a muff, when it's cold use the gloves and muff with some hot hand packs inside. Oh' cut the trigger finger out of the glove.

As far as other clothing, you want a good base layer of ploy-pro or something similar. And a good outer layer that is wind proof. What you wear between them really doesn't matter, what's next to your skin and the outer most layer is what gets it done.