For wet cold areas, panty hose/tights are good. Help keep your legs warm and do not hang baggy loose like woolen long johns. Hot areas I go with cotton boxers if I can wash them at end of day. Bit more hygienic then a lot of older synthetics. Some of the newer stuff is good. I know a few blokes that wear bike shorts in hot humid areas, I wore them when I did the Kokoda Track in PNG. Rained nearly every day. They were great.