When I was working above the snowbelt my work clothing of choice became snow boarding gear. The stuff is built with patches on knees, butt and elbows that kept me a bit drier. The gear also was just baggy enough to allow easy movement.
A pair of bibs with full side zips on the legs were perfect! They were baggy enough to keep my insulation layers tucked in so that there was no 'kidney gap'. At lunch, or for the drive, I could shed the pants without taking off my boots. The snowboard pants were cheap too...around $40. Snagging cheap clothes doesn't hurt as much!
If I was still in cold country I would have a jacket custom made by Beyond Fleece...follow Hollen's link.
YOu take careful measurements of your body and they make a pattern to fit your body. when I priced out an off the rack soft shell the Beyond Fleece jacket cost about 5% more without any fancy options. Having a jacket that fits my long arms would have been worth any difference in price.
clothing is as much a tool as chainsaws, rope and trucks. Buying crappy clothes is like using hardware store rope for climbing line.
Pit zips in all layers makes venting easy. Overheating, even at sub zero air temps will lead to chilling. Get rid of the sweaty air from inside your clothes.