I recently bought a pair of Cabela's Superwash wool hunting pants. I wore them on a trip a few days ago. Temp was about 15 F, NW wind 15 kts. light snow. They are great. They have two cargo pockets for maps etc. arse end pockets and two front slash pockets. And they are machine-washable.
I usually wear light merino wool long johns, merino wool short sleeved shirt, followed by a merino wool longsleeve shirt. Over top of this mess, a zipper up polar fleece heavyweight jacket. And of course my Filson wool packer hat. I can hike all day in this get up and stay toasty warm.
I have not tried the Filson line of pants. No doubt, like their other stuff, they are of good quality but the fact that they can only be dry-cleaned really deters me.
Northerner mentioned pac boots. I recently bought a pair of Schnees Hunter II (based on advice from this group) and am amazed at how warm and comfortable they are and how they fit just like a hiking boot. Best boots I've ever owned.