Excellent discussion, I'm sure enjoying everyone's insights.
I concur, guidance is dependent on the location. Many decades ago, I was a scout in Arizona and learned some great survival skills for the desert. After a couple years in Arizona, our family moved to Alaska, and after joining a troop up there, I found myself learning a whole different set of skills. Humbling, but very worthwhile.
Re the cotton clothing topic: I'll offer up what was taught to us scouts in Alaska for winter camping, long before the era of modern synthetic clothing. When cotton gets wet, it stays wet and is difficult to dry. The wet and cold wicks away body heat, and if you can't get dry or warm, you know the rest.
Wool, on the other hand, will keep you warm even when wet. Got some old military wool pants at the surplus store (nice and baggy to trap body heat, cheap, tough as iron) and wore them over the classic long johns. With a good pair of snow boots and gaiters, I stayed warm.
Things have evolved quite a bit since then, so I don't offer the above as gospel, just a slice of history. Thanks for perspectives, I'm learning a lot.