Cast on 48 sts (12 on each needle). Join being careful not to twist sts.
Row 1: *K 1, p 1; repeat from * around.
Row 2: Knit around.
Repeat Rows 1 and 2 for 1 1/2".
Begin Cable Pattern (12 st repeat)
Row 1-3 *(P 1, k 4, p 1, k 6); repeat from * around.
Row 4 *(P 1, C2F, p 7); repeat from * around.
Repeat these 4 rows for pattern until work measures 6 1/2" or desired length from beginning, ending with Row 2. Knit across needle one and turn work.
Row 1: Slip 1, then purl remaining sts across Needles 1 and 4. Place these 24 sts on one needle for heel flap.
Row 2:(Slip 1, k 1) across needle. Repeat Rows 1 and 2 until 21 rows have been completed, ending with a purl row and RS facing you.
Row 1: Slip 1, k 13, SKP, k 1. Turn work.
Row 2: Slip 1, p 5, p2tog, p 1. Turn.
Row 3: Slip 1, k 6, SKP, k 1. Turn.
Row 4:Slip 1, p 7, p2tog, p 1. Turn. Continue in this manner, working one more stitch before decrease on each row until all heel flap sts have been worked. Knit across 14 heel sts and begin gussets.
Pick up 12 sts along the side of the heel flap, M1 in loop between heel flap and instep needle, work pattern across two instep needles, M1 in loop between instep needle and heel flap, pick up 12 sts along other side of heel flap. Divide heel sts between Needles 1 and 4. Work 1 row around, knitting M1 sts together with 1st and last instep sts. Maintain pattern on instep needles.
Round 1 (dec): Knit to 3 sts from end of Needle 1, SKP, k 1. Work instep pattern on Needles 2 & 3. K 1, k2tog, knit remaining sts on Needle 4.
Round 2: Work one round with no decrease, always maintaining pattern on instep. Repeat Rounds 1 and 2 until there are 12 sts on each needle - 48 sts.
Work around as established, continuing pattern on instep, until length of foot from back of heel is 1 1/2" less than desired.
Round 1 (dec): Knit to 3 sts from end of needle 1, SKP, k 1. K 1, k2tog, k remaining sts on Needle 2. Knit to 3 sts from end of Needle 3, SKP, k 1. K 1, k2tog, k remaining sts on Needle 4.
Round 2 Knit one round.
Repeat Rounds 1 and 2 until 5 sts remain on each needle. Combine sts from Needles 1 and 4 on one needle and sts from Needles 2 and 3 on one needle.
Holding the 2 needles parallel with wrong sides of fabric together, thread a blunt tapestry needle with one of the yarn ends and
1) insert it as-if-to-knit through the first st on the front needle and let the st drop from the needle.
2) Insert the needle into the second st on the front needle as-if-to-purl and pull the yarn through, leaving the st on the needle.
3) Insert the needle into the first st on the back needle as-if-to-purl and let it drop from the needle, then
4) insert it as-if-to-knit through the second st on the back needle and pull the yarn through, leaving the st on the needle. Repeat 1-4 until all sts are gone. When finished, adjust tension as necessary. Weave in ends.<