The stitch pattern on the leg was taken from The Harmony Guide to Knitting Stitches—Volume 2, and adapted for knitting circularly.
The sock has a French heel and wedge toe.

Erratum:
Please note that row 2 of the heel flap should read: K3, *Sl1P, K1; repeat from * to last 4 stitches,Sl1P, K3.

Permission is given to share this pattern freely in unmodified form, provided no profits are made from its distribution.