Let your ankles be frilled by this cute little sock!
First work the sock in ribbing throughout, setting up stitches to later work the afterthought heel. Then shape the toes and heel in stockinette stitch. Next pick up stitches around the ankle with lace weight yarn and shape the frill using open-horseshoe lace and lots of increases!

Measurement taken from around the middle of your foot: (the leg and foot lengths are worked to your own measurements in the pattern)

17-19 (20 - 22) 23 -24 (25 - 26)CM
6.5 -7.5 (8 - 8.5) 9-9.5 (10)INCH