With A, cast on 27 stitches.
Row 1: P3, (k1, p3) across.
Row 2: K3, (p1, k3) across.
Repeat last 2 rows until piece measures about 66 in. (152 cm) from beginning. Bind off all sts.
Fold piece in half crosswise. Beginning at fold, seam 11 in. (28 cm) down for hood.
From right side, join 2 strands of B with slip st, anywhere along outside edge of piece. Work 2 rnds sc evenly spaced around entire piece, working 3 sc at each corner.
Weave in ends.