My feet always get cold. I always hunt from a treestand, and I always used to stand up most of the time. I figured out that when I sit more it takes the pressure off my feet and they stay warmer longer.
I also so started to use the chemical handwarmer thingies that have stickum on 'em that sticks to your shirt,(they also make ones that are toe shaped and stick to your socks). Anyhow, take the 2 toewarmers that come in a pack and put one under each armpit, or one on your lower back and one on your bellybutton, Don't put em directly on your skin!! or use the bigger body sized ones for a longer burn time. Body core stays warm, feet stay warm, you won't believe it til you try. Wait until you get to your stand to put em on. Don't have to wear as much bulky clothing either.