Back: Cast on 60 (68, 76) stitches. Work in stockinette stitch until piece measures 12 (13, 14) inches from cast on edge.Front: Repeat back instructions. At 8 inches, shape the square neckline by binding off center 12 (14, 16) stitches and working each side separately, decreasing 1 stitch at the neckline edge every other row.
Cast on 38 (42, 46) stitches. Work in stockinette stitch, increasing 1 stitch at each end every 4th row until there are 56 (62, 68) stitches. Work even until sleeve measures 18 (19, 20) inches from cast on edge.
Sew shoulder seams. Set in sleeves. Sew side and sleeve seams. Weave in ends.