With RS facing, slip centre 24 ( 24: 26) sts onto a holder, rejoin yarn and K to end. Complete to match first side, reversing shapings. Using 3.25mm needles and yarn A, cast on 38 sts. Work in rib as given for Back for 14 rows, dec ( inc: inc) 1 st at end of last row and ending with RS facing for next row. 37 ( 39: 39) sts. Change to 4mm needles. Beg with a K row, work in st st, shaping sides by inc 1 st at each end of 5th and every foll 6th row to 53 ( 55: 51) sts, then on every foll 8th row until there are 55 ( 59: 61) sts.