Cast on 57 sts using 4mm needles and yarn A.
Row 1 (RS) Purl.
Row 2 Knit.
Row 3 (RS) P3, * long st (insert needle into stitch 2 rows below stitch and K1 dropping the unworked st), P3; rep from * to end of row.
Row 4 Knit.
Row 5 Purl.
Row 6 Knit.
Row 7 (RS) P1, * long st (insert needle into stitch 2 rows below stitch and K1 dropping the unworked st), P3; rep from * to last 3 st, long st, P3.
Repeat these 7 rows until the knitting measures 8cm ending on a K row.
Next row Change to yarn B, K1, *P1, K1; repeat from * to end of row.
Continue in moss stitch for four more rows.
Cast off in pattern.
To Make Up:
Weave in all loose ends.
With right side facing, pick up and knit 10 sts with yarn A, 4cm up from the cast-on edge. Continue in stocking stitch for 3.5cm, ending on a WS.
Buttonhole row K2, yo, k2tog, K2, ssk, yo, K2.
Continue in stocking stitch for 1.5cm.