OK when it's cold I like to wear a couple of layers of expedition weight Thermax long underwear. They keep you warm and wick away any moisture if you should do some walking and start to sweat. Over that a layer of wool followed by an insulated windproof jacket. For hands the fold over glove/mittens mentioned by Sooner are great. Mittens really keep your hands much warmer than glowes and you can quickly and easily fold them back to shoot. I also like to stick a small heat pack inside each one on really cold days. Another great thing to wear is a polarfleece baclava. The long kind that you can fold back up inside itself for a face shield. Those things hold your body heat in like no other and with the botto tucked into your jacket it helps keep all the heat in. For your feet wear a wool blend sock and get some good cold weather boots with at least 1000 grams of thinsulate.