With larger needles, cast on 41 (47-59-83) sts.
Knit 6 rows (garter st), inc 4 sts evenly across last row. 45 (51-63-87) sts.
1st row:WS). Knit.
2nd row*K1. P1. Rep from * to last st. K1.
Last 2 rows form pat.
Work 1 more row in pat.
Cont in pat, inc 1 st at each end of needle on next and every row to 51 (61-73-105) sts, then on every following alt row to 55 (69-83-123) sts, taking inc sts into pat. Work 1 row even in pat.
Leg Openings: Next row:(RS). Pat across 5 (5-7-11) sts. Cast off 4 (6-6-10) sts. Pat across 37 (47-57-81)sts (including st on needle after cast off). Cast off 4 (6-6-110) sts. Pat to end of row.
NoteAll Leg sections are worked at the same time using separate balls of yarn for each section.
Work 1 (1 1/2-1 1/2-2 1/2) ins [2.5 (4-4-6) cm] in pat, ending with WS row.
Joining row:(RS). Pat across 5 (5-7-11) sts. Cast on 4 (6-6-10) sts. Pat across 37 (47-57-81) sts. Cast on 4 (6-6-10) sts.
Pat to end of row 55 (69-83-123) sts.
Cont even in pat until work after neckband measures 5 (6 1/2-8-11) ins [12.5 (16.5-20.5-28) cm], ending with WS row.
Place marker at each end of last row.
Back shaping:Cast off 6 (7-9-13) sts beg next 2 rows. 43 (55-65-97) sts.
Next row:(RS). ssk. Pat to last 2 sts. K2tog.
Rep last 2 rows to 27 (37-43-67) sts.
Cont even in pat until work after neckband measures 10 (12 1/2-15 1/2-21) ins [25.5 (32-39.5-53.5) cm], ending with WS row. Leave sts on a spare needle.
Back Edging:(RS). With RS of work facing and circular needle, pick up and knit 33 (37-51-67) sts along body from marker to back. K27 (37-43-67) from spare needle dec 1 st at center. Pick up and knit 33 (37-51-67) sts along opposite side of body to marker. 92 (110-144-200) Do not join in rnd. Knit 8 rows (garter st). Cast off. Sew neck and belly seam.
Leg Edging:(RS). RS of working and double-pointed needles, pick up and knit 23 (29-32-38) sts around leg opening. Divide sts on 3 needles. Join in rnd, placing a marker on first st.
Rep last 2 rnds 3 times more.