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Starting at lower edge with double strand of A and size K hook, ch 39 (39, 43, 43). ROW 1: Sc in 2nd ch from hook and each remaining ch. Ch 1, turn—38 (38, 42, 42) sts. ROWS 2-5: Sc in each st across row. Ch 1, turn. ROW 6: Work 1 sc and 1 dc in first st, * sk next st, work 1 sc and 1 dc in next st; repeat from * to last 3 sts, sk next st, sc in next st, dc in last st. Ch 1 to turn all rows—38 (38, 42, 42) sts. (Repeat Row 6 for pattern.) ROWS 7-24 (26, 28, 30): Work even in pattern. About 10 (11, 12, 13)″ from beg.
SHAPE ARMHOLE AND RAGLAN: ROWS 25-38 (27-40, 29-44, 31-46): Keeping pattern as established, dec 1 sc and 1 dc at beg of row, work 1 sc and 1 dc in next st, work in pattern across remaining sts—36 (36, 40, 40) sts. (To dec 1 sc: Draw up a loop in first 2 sts, yarn over and draw through all 3 loops on hook. To dec 1 dc: Keeping last loop of each st on hook, work 1 dc in each of next 2 sts, yarn over and draw through all 3 loops on hook.) ROW 39 (41, 45, 47): Work even in pattern. Fasten off. About 17 (17¾, 19½, 20½)″ from beg.