(photo courtesy of vanillabeanknits) on Flickr.
Here is the website and the directions follow from their webpage: Legwear:
These leg warmers will be most appreciated in the dead of winter when temperatures plummet and winds wail, but be sure to have them crocheted and ready to wear.Knitting pattern: "I didn't really use a pattern, I just used a little math and knit a 1 x 1 rib. I kept knitting until they were long enough to stretch up to my thighs if cold weather required." Courtesy of VanillabeanKnits
Directions are given for size 9-11. You will need two 4 ounce, skeins of 4 ply yarn and sizes I and K crochet hooks.
Gauge: 3 hdc equal 1 inch
Starting at lower edge with smaller hook, ch 30, join with sl st to form ring, ch 2, do not turn.
Row 1: Sc in each ch, join with sl st in top of ch-2, ch 2, do not turn.
Rows 2 through 8: Repeat Row 1.
Row 9: With larger hook, ch 2, hdc in each sc across, join with sl st in top of ch-, ch 2, turn.
Repeat Row 9 to length desired, after last sl st, fasten off