http://www.garnstudio.com/lang/en/visoppskrift.php?d_nr=98&d_id=45&lang=en My daughter likes these leg warmers, without the bottom lace edge. I can't find yarn that thick so I used yarn 15sts=4" and doubled it to get the tension. SHe likes the chunky look with the cable in the front. Have you seen one with it made on circular needles? I think it should be done on circ so there is not seam and no bump against her leg. She is wearing it with a kilt and nylons so they have to be able to stay up without wearing jeans.
Those are cute....If you want to do them in the round a 12 in circular needles would probably work, or you could just use double points. I know I'd prefer legwarmers without a seam.
I think if you make them on DPN's that should work. Hmmmm.... :??