This instructable will show you how to make insulated work pants. I used a wrecked pair of carhartts and a wrecked pair of sweats. You are welcome to use new pairs of either, but if you've followed any of my 'ibles, I repurpose lots of old pants and shirts, (apparently, 1 carpenter + 1 biologist = LOTS of torn clothes, who knew) Also, feel free to use any work pants, sweats, fleece, flannel, whatever.
The only tips on pant selection is that the liners should be a bit loose, (not spandex, etc.)
The outside pants should fit you slightly larger than normal (ex. I used a pair of my husbands old work pants which are a full size bigger than I would normally wear, and my old sweats which fit me normally)
Step 1: Bill of materials
-warm & fuzzy pants