http://www.lewrockwell.com/rep/stay-dry.htmlYes, I know, rudimentary stuff.
Some problems with polypropylene underwear include that it's expensive, and that it only comes as separate tops and bottoms.
Tom and I were discussing this the other day: two piece long long drawers tend to fall down. Tension and gravity kinda pull them down and pretty soon there's no underwear around one's loins.
I do wear woolen socks. Those are widely available.
I think another problem is that cold-weather clothing is extremely dominated by ski-bunny-wear. I think that makes it more expensive, and less practical as cold-weather work duds. When I'm outdoors in cold and wet, it's either work, or search and rescue of kids stranded in bad weather.