Finished small is 10 inches long; medium and large are 12 inches long. Circumference varies around the project, but the small starts 8 inches around, medium almost 11 inches and large almost 13 inches. They stretch a lot. Size medium is pictured. To fit a child (small adult, medium adult).

These legwarmers are meant to be snug to wear under pants or inside boots. They are shaped from bottom to top by changing the size needle used rather than increasing stitches.

This pattern was on About.com (which no longer exists) and has been deleted from their site, but for now it can still be found on the Internet Archive. They redirect and delete pages a lot so you may want to download/print to save.