RE: Heater Bodysuit
You might consider trying to keep you feet,head and hands warmer.
I am like you as far as getting cold feet.
I've tried two things that work pretty well.
I spray anti-perspirant on my feet before dressing. (NOT deodorant, it only makes the sweat smell good). This prevents your feet from sweating on the way to your stand, and thus you don't arrive with wet socks.
I've also bought a good pair of pac boots, which are rated for about 30 below or something like that. They aren't too bad to walk or climb in, and my feet are always warm, down to about 20 degrees. After the temp drops below 20, I out of the stand. I can't seem to enjoy the bowhunting after it gets much colder than that.
Hope that helps.