With 1 strand each of A and B held tog, cast on 28 sts. Work even in St st until piece measures 8 inches from beg, ending with a WS row.
First Half Knit 7 sts, place remaining 21 sts onto stitch holder. Work 5 more rows in St st. (K 2, k2tog, turn. P 3, turn) 4 times. Place remaining 3 sts onto a stitch holder.
Second Half Knit 7 sts at end of row from stitch holder, leaving 14 center sts on holder. Work 6 more rows St st. (P 2, p2tog, turn. K 3, turn) 3 times, (p 2, p2tog) once. Place remaining 3 sts onto stitch holder.
With RS facing, k across first 3 heel sts from holder, pick up and knit 4 sts along side of heel; knit center 14 sts from holder; pick up and knit 4 sts along side of second half of heel, k remaining 3 sts from holder – 28 sts.
Work even in St st until Foot measures 4 inches.
First Half K2tog, k 3, k2tog twice, k 3, k2tog – 10 sts. Place remaining 14 sts onto a stitch holder for second half of toe.
Rows 2, 4, and 6 Purl.
Row 3 K2tog, k 1, k2tog twice, k 1, k2tog – 6 sts.
Row 5 K 2, k2tog, k 2 – 5 sts.
Row 7 K2tog, k 1, k2tog – 3 sts.
Bind off as if to purl.
Second Half Slip remaining 14 sts from stitch holder onto needle. Work as for first half of toe.
Divide C into 3 equal balls. With WS facing and 3 strands of C held tog, from inside of cast on edge, pick up and knit 28 sts.
Next Row Kf&b, k 26, kf&b – 30 sts. Knit 13 more rows. Bind off loosely.
Sew back seam. Sew foot and toe seams. Fold cuff to RS at halfway point.
With crochet hook and 1 strand each of A and B held tog, attach yarn to back seam at cuff fold. Chain 12, slip st to attaching space. Fasten off. Weave in ends.