Image: Iroquois fashion. The dude on the right has culturally-appropriated a European blanket and an iron or steel hatchet.
Like Elizabeth Warren and hundreds of thousands of Eastern Americans, we were raised on the myth of Indian blood. Spit test says none. I came out 85% English and 15% Scandinavian. I assume the Scandinavian is from the Normans (ie the Frenchified Vikings).
I mainly focus on the northeastern Indian cultures. For them, winter was a mixed blessing. Hunting and transportation was easier, fishing was more difficult. Groups that lived near the coast moved inland and built weather-proof wigwams and longhouses, some as much as 100' long. If they had a good summer corn (maize) crop in the summer, they would not starve. Remember, the northeastern Indians had hundreds of acres of corn, bean, and squash fields. Sometimes they starved when the food ran out. They did ice-fishing, and sometimes did cannibalism.
What about winter clothing? Deerskin leggings, deerskin shirts, and cloaks or coats of animal skins. Also, they greased themselves down with animal fats, preferably bear fat, as insulation.