You might provide more details on your situation. What game animal? What kind of hunting tractic you employ? What altitude? What state?

I hunt at 11000' in mid-October in SW Colorado: first season elk hunting. In good weather, night temperatures drop to 15 degrees and day temperatures go up to about 50. I sit and watch for elk at ambush sites. So, I'm there about 45 minutes before shooting light (75 minutes before sunrise), and that is the coldest time during the day. I warm up walking to my spot -- about 2-4 miles hike-in. But after I have sat at my spot for 20 or 30 minutes, that heat from exercise is gone.

I wear an inner layer of Minus 33 Merino Wool, which is great. I wear 24 ounce medium weight wool trousers (M-51 Army Surplus) and 13 ounce medium weight wool shirt (Pendleton). Over that I wear a heavy weight wool vest (Filson). Over that I wear a Dry Plus Parka from Cabela's. It has a fair amount of synthetic insulation, but I don't know how to articulate how much insulation. It is a relatively heavy coat I would say and has a good hood with draw strings to close the openings. I have good warm gloves. I wear a polypropolene balaclava. My boots have 400 grams of Thinsulate in them (Meindl Perfekt Hunters) and I wear a thin wicking inner sock and heavy wool socks over those. Other than my feet, I don't get cold in this gear under the conditions I described above. My toes do get cold, but that is just the way it goes. If they get too cold, I stand up and walk around a little bit. For me, any time I get too cold, I just stand up and walk around a little bit.

Depending on your circumstances, you could do something unusual like take a sleeping bag with you and slip it over your lower body. I did this once deer hunting where I only walked in about 1/2 mile from my truck. The kept my feet and lower body warm enough. That wouldn't be a practical solution for my 2-4 mile walk in for elk hunting, I don't think. I don't want to pack in a sleeping bag along with my other stuff. I would rather pack-in my game bags, bone saw, and several knives so if I get an elk I can carry a first load back with me on the hike-out.