I find TNF does some neat synthetic stuff, but that's not what you're looking for. I'm a "gentleman adventurer" in my spare time in both mountain and desert biomes.
Columbia does nice trekking clothes (stuff for yuppies to wear while drinking wine on the WCT) but the best stuff I've had is to get a pair of wool trousers from the surplus store, add a cotton safari jacket from GAP or HBC and wear them to threads.
Of note, if you're worried about the technical feasibility of cotton, wear a synthetic core layer underneath it and the cotton will get the dirt and the core gets the sweat. Cotton generally is uncomfortable as an internal layer in the cold weather, especially in snow.
That said, if I could find a leather fatigue jacket in my size, I'd be in heaven. My grandfather was a furrier and made clothing like that his whole life (fur lined coats for adventurers) as he spent a fair amount of time in the outdoors.