Okay you Alaska and other cold state folks, lets hear your bad weather coat recommendations???????
Fur — you can't beat it. While some of the newest synthetic materials come close, for holding in the body heat; you simply can't beat wolf or coyote fur, for the trim on a parka. When it's really cold (colder than -40*), you can draw the trim fur around your face & still look and breath through it. If you tried this with synthetics, you'd only succeed in creating icicles.
Move to Blythe California.
Buffalo robe, and rabbit fur lined elk hide boots & gloves.
More help to keep warm: Heap big pile of black rock that burns. Eat lots of fatty foods.
When all else fail, crazy monkey sex generate much heat...at least freeze to death happy.