Agree on layers. I prefer a poly thermal (no cotton allowed...) Layer on in thin layers. Avoid one piece mega parkas, they are great to sleep in, but you need to be able to remove a layer or two for when moving about, then don the extra layers once you chill down a bit. For legs, I ususally wear just a thermal, then microfiber rain pants. Just these two layers. If really cold, maybe toss in an extra layer of fleece legs.... Wader liner fleece pants are awesome inside raingear.....
For hunting in sloppy wet blowing snow (Western WA...) I wear heavy rubberized raingear over wader liner fleece etc...Dress like a commercial crabber or fisherman... This system is loud and I actually hate it, but it keeps you dry and warm. Dry and Warm means I can keep hunting...
