http://go-armynavy.com/military-surplus/collectibles/australian/australian-military-wool-pants.html

These are the best hunting pants I have ever used. In my opinion, they are the perfect weight. Change up the type of long underwear you use and they will take you from the 50s or even 60s down to below zero. Warm when wet, absolutely silent and that button gaiter on the the hem really works well; no gaiter necessary. They have a double seat for durability and seem to wear very well; I've had mine for over 20 years, though my hunting has tapered off recently. They are getting hard to find in all the sizes so if you find a pair that fits, just buy them (buy them a little long). At fifty bucks they are a steal...