Cast on 60 stitches.

Rows 1-4: Knit

Rows 5-8: K3, *P3,K3* to last 3 sts, K3

Rows 9-12: K3, *K3,P3* to last 3 sts, K3

Rows 13-60: Repeat rows 5-12 six times

Rows 61-64: Repeat rows 5-8

Row 65: K2tog to end (30 sts left)

Row 66: Knit

Row 67: K2tog to end (15 sts left)

Row 68: Knit

Row 69: K2tog, K2tog, K9, K2tog (12 sts left)

Rows 70-95: Knit

Row 96: K4, K2tog, K2tog, K4

Row 97: K5, YO, YO, K5

Row 98: K6, P1, K5 (now you have a buttonhole)

Row 99: Knit

Row 100: K2tog, K to last 2 sts, SSK

Row 101: Knit

Repeat rows 100 and 101 twice.

Cast off, weave in ends and sew button on.