When the mercury drops below the zero mark my attire is the light weight Under Armor the military issued ECWG (extreme cold weather gear) either a heavy ThinsuliteGor-tex pant or a pair of flannel lined denim pants and Gor-tex over pant if its wet. Upper the same under clothing a heavy flannel shirt and my Browning or Arctic Shield jacket. A Gor-tex hat with a heavy balacava in my pack. On my feet is a silk calf high sock then a nice thick wool sock. Depending on the temp or how I plan on hunting I will either wear a pair of 800 gram thinsulite leather boots or 1200 gram thinsulite rubber boot.
I carry extra socks in my pack and my pack is big enough that I can put in any garments that I may not wear or need to remove.