I find that for your feet you need a good pair of winter boots with thinsulate in them and i wear a pair of poly-wool socks(polypropylene moves moisture away from the foot) and another pair of just wool socks and as BuckRogers said tape some of those hand warmers to your feet(that is if you are sitting all day if you are walking you shouldnt need them). As for pants and jacket all i did is buy Carhartt winter jacket and overalls and they block all wind and they are super warm then i just buy thin camo and put it over top of that. As for hands i usually have a bulky warm glove on my left hand(non shootin hand) and for my shootin hand i just have a thin wool glove on and hand warmers in my pocket. My head i usually wear a toque/beanie and a a hood from a hoody im wearing but i always carry a balaclava in my pack in case the wind really picks up. Under all my clothing i wear Helly/Hansen Poly-Pro Thermal Long Johns. This combination has kept me nice and toasty warm in -35 weather. But the best thing is the Poly-pro clothing, it keeps you dry and warm and its thin and lite, but it does come at a cost.