I started off with a ribbed Salvation Army sweater (I think it was originally old navy or something). I cut off the sleeves, picked up the stitches on the first intact row, and cast off. I'm really excited about the way they turned out. They kept me super cozy on the way to work this morning in sub-20s weather. The only problem is that the cast off edge is a bit tight. If I were to do this again, I'd try to find some yarn elsewhere in the sweater to salvage. Then I'd knit a few more rows in pattern, and cast off incredibly loosely.