Cont straight until Sleeve meas 26 ( 30: 34) cm, ending with RS facing for next row.
Cast off 2 ( 3: 3) sts at beg of next 2 rows. 51 ( 53: 55) sts. Dec 1 st at each end of next 5 rows, then on foll 3 ( 4: 5) alt rows, then on foll 7 rows, ending with RS facing for next row. 21 sts. Cast off 3 sts at beg of next 2 rows. Cast off rem 15 sts. Block pieces gently, following any yarn care instructions on the ball band. Join right shoulder seam using back stitch, or mattress stitch if preferred.
Using 3.25mm needles and yarn A, and with RS facing, pick up and knit 10 ( 13: 13) sts down left side of front neck, K across 24 ( 24: 26) sts on front holder, pick up and knit 10 ( 13: 13) sts up right side of front neck, and 4 sts down right side of back neck, K across 30 ( 32: 34) sts on back holder, then pick up and knit 4 sts up left side of back neck. 82 ( 90: 94) sts. Beg with row 2, work in rib as given for Back for 7 rows, ending with RS facing for next row. Cast off in rib.