Here in NW Montana it really depends on the weather. But if it's moderatly cool, the first layer is always poly pro long undies. I do a lot of hiking, (sometimes up to 10 miles for the day on logging roads. One year logged 82 miles on logging roads in 11 days!). At any rate, if it's early fall and fairly warm yet, (40-50's), I'll wear a pair of whipcord wool pants and a fleece shirt. If it's colder, then Ill go to to a pair of heavy wool pants, fleece shirt, wool vest, maybe a wool sweater, and then a either a goretex 3 in one parka, or a pullover windstopper goretex jacket. Boots are goretex 600 grams, or I have a pair of snow pacs too. I try, to stay clear away from cotton clothes of anykind, in this country, you'll hike and sweat, and then stop to sit and with enough breeze or temps, you can get real cold real quick.