With A, cast on 38 sts.
With A, work 15 rows in K1, p1 Rib. Cut A. With B, work 15 rows in K1, p1 Rib. Cut B. Rep from * 14 more times. Bind off.
With B, cast on 100 sts.
Work in K1, p1 Rib for 15 rows. Change to A and work 15 rows in K1, p1 Rib. Change to B and work 1 row in rib.
Next Row: Work in rib as established across 25 sts, *place a marker, work in rib as established across 25 sts; rep from * twice more– 4 groups of 25 sts each with a marker between each group.
Next Row: K2tog, *work in rib to 2 sts before next marker, k2tog, slip marker, k2tog; rep from * across – 92 sts at the end of this row.
Continue in rib as established, dec 1 st at beg of row, dec 1 st before and after each marker, dec 1 st at end of row.
Rep last row until 12 sts rem. Cut yarn, leaving a long tail. Thread tail through rem sts and gather tog. With same tail, sew back seam.
Weave in ends.