I didnt' have time to read through all the posts on this thread - but, here are my personal basic rules for staying warm:
#1. DO NOT OVER DRESS on the way to your stand and climbing your stand. This includes the boots you wear. The #1 worse enemy in your search to stay warm is getting sweaty. Dress extremely light and carry outer layer(s) with you.
#2. Wearing lots of layers was how we did it in the old days - but, see step #1.
#3. I wear some kind of silky "Under Armour" type stuff for a base layer. It wicks and allows sweat to dry quickly.
#4. In extremely cold weather - I dress light (silky base layer, long sleeve shirt, normal pants, uninsulated or maybe 600 gram insulated boots) and I take an IWOM or something similar put it on in the stand.
#5. On moderately cold days (30-50 degrees) - I dress light, and once in my stand - I wait till I am completely dry - and then slip on some insulated pants and coat. If my feet are cold, I put some boot blankets on over my boots. I actually have a deal that is like a half sleeping bag with shoulder straps. It comes up above my waist. It takes the place of insulated pants and boot blankets. I use it and my coat. If I am still cold after doing this - I put a couple of body warmers down in the "half sleeping bag".
#6. Personally, I don't wear rubber boots. Rubber boots do not breath and cause your feet to sweat. That's a BIG problem. Now, if you have a short walk and are just sitting on the ground or climbing a ladder stand, they are probably fine. But, I usually have a long walk and use a climber. I cannot allow my feet to get sweaty.
This system has allowed me to hunt in some very cold weather. Of course - if it get's bitter cold - 10 degrees or below, I will add a layer or two to this set up. Usually silky as a base layer and some kind of fleece on top of it, followed by the outer layers mentioned above. Again - STAYING DRY TILL YOU GET TO YOUR STAND or DRYING OFF BEFORE you put your outer layer on is Paramount!
I hope this will be some help to you. Happy Hunting!