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
Step 2: Lining things up
1. Just to be safe, try on both pairs of pants at he same time to make sure they fit.
2. Turn both pairs of pants inside out
3. Put the fuzzy pant over the work pants.
4. line up the waist, front, back and side seams
5. Pin the fuzzy pants so that you can sew
6. Pin along the fly, so that you don't sew the fly up