You have to find a way tolerable to you to walk in cold and then dress at the tree or preferably in the tree.
I don't want to deal with heated clothing, so my solution is:
1. buy tons of Hot Hands adhesive body warmers and super warmers when wally world has a sale and use them liberally (like 4 on your torso on base layer when really cold, key location is high kidneys where you can pull in arms and get turbo heat).
2. buy high quality down jacket, down vest, and down insulating pants and compress all that down along with a windproof shirt inside a compression stuff sack that fits inside my 32 liter hunting pack