I whipped up this pair of valentines baby leg warmer for Charley today in five minutes!! It was an experiment gone right!!
I bought a pair of regular length socks from Joanns for $1.50. Then just cut the foot part off.
Then I sewed the raw edge with a zigzag stitch on my sewing machine. I didn't pin it so the edge has a ruffle look which I think is cute. But you could pin the raw edge to get a cleaner look. You can also buy a longer sock to the knee to have more fabric to work with. Charley is 3 months so the sorter ones worked perfect but the next pair I'm going use a longer sock. If you don't have a sewing machine it would be easy enough to hand sew them.