OK, I know that "cotton kills" and that breathable synthetics are best worn while hiking, but what about your "camp clothes", those extra warm and clean extras you keep dry for sleeping; Any reason why you can't wear a nice warm mostly cotton sweat shirt and/or pants, considering that if THEY get wet, you probably are already in big trouble? Or is it best to stick with polyester fleece (or similar if you can find it) if you need it to supplement your day wear for some reason. I'm talking about April on the Southern AT when the night temps can dip below freezing and you can still get hit with a snow storm. I am trying my best to keep my pack weight down but I have no intention on flirting with hypothermia if I can help it. And I'm already pretty low on body fat so I might be sleeping cold to start with.......I used to live in Alaska, so I once thought freezing was t-shirt weather, but after 20 odd years in Florida I've been ruined in that regard. Thoughts?