Coldest I've hunted in here is 3deg.
In those (or anything CLOSE to that) I wear:
Muck boots (Woody max)
Wool socks
Patagonia silks on the bottom
UA coldgear on the top
Fleece pullover (top)
Wolfskin pants (unlined)
Predator fleece vest
Wolfskin jacket (unlined)
Fleece stocking cap
UA coldgear facemask
UA coldgear gloves
I also use a HSS hand muff with hot hands inside.
Rarely have issues with my feet, body or legs getting cold. What KILLS me in temps <20deg is my hands....if I have to hold my bow for extended periods of time.