With MC and smaller needles, cast on 40 (46-58-82) sts.
Beg with a WS row, knit 9 rows inc 4 sts evenly across last row. 44 (50-62-86) sts.
Change to larger needles and beg with a knit row, work 2 rows in stocking st.
Next row: (RS). Inc 1 st in first st. Knit to last 2 sts. Inc 1 st in next st. K1. 46 (52-64-88) sts.
Cont in stocking st, inc 1 st at each end of needle, as before, to 50 (60-72-104) sts, then on following alt rows to 54 (68-82-122) sts.
Purl 1 row.
Leg Openings: Next row: (RS). K5 (5-7-11). Cast off 4 (6-6-10) sts. K36 (46-56-80) (including st on needle after cast off). Cast off 4 (6-6-10) sts. Knit to end of row.
Note: All Leg sections are worked at the same time using separate balls of yarn for each section.
Beg with a purl row, work for 1 (1½-1½-2½) ins [2.5 (4-4-6) cm] in stocking st, ending with purl row.
Joining row: K5 (5-7-11). Cast on 4 (6-6-10) sts. K36 (46-56-80). Cast on 4 (6-6-10) sts. Knit to end of row. 54 (68-82-122) sts.
Cont even until work after neckband measures 4½ (5½-7-10) ins [11.5 (14-18-25.5) cm], ending with purl row. Place a marker at each end of last row.
Back Shaping: Cast off 6 (7-9-13) sts beg next 2 rows. 42 (54-64-96) sts.
Next row: (RS). Sl1. K1. psso. Knit to last 2 sts. K2tog.
Next row: Purl. Rep last 2 rows to 26 (36-42-66) sts.
Cont even until work after neckband measures 10 (12½-15½-21) ins [25.5 (32-39.5-53.5) cm], ending with purl row. Leave sts on a spare needle. Sew neck seam to markers.
Back Ribbing: With RS facing, MC and circular needle, pick up and knit 33 (37-51-67) sts along body from marker to back. K26 (36-42-66) from spare needle dec 3 (3-5-5) sts evenly across. Pick up and knit 33 (37-51-67) sts along opposite side of body to marker. 89 (107-139-195) sts.
**Join in rnd, and placing a marker on first st, proceed as follows:
Next rnd: Purl.
Next rnd: Knit.
Rep last 2 rnds 3 times more. Cast off purlwise.**
Leg Edging: With RS facing, MC and first double pointed needle, pick up and knit 7 (9-10-12) sts. [With next double pointed needle pick up and knit 7 (9-10-12) sts] twice. 21 (27-30-36) sts. Work from ** to ** as given above.
Pocket: With A and larger needles, cast on 25 (25-30-30) sts.
Proceed in stocking st for 5 (5-6-6) ins [12.5 (12.5-15-15) cm], ending with a purl row. Cast off.
Pocket Flap: With A and larger needles, cast on 12 sts.
1st row: (WS). P3. Knit to end of row.
2nd row: Knit to last 4 sts. Inc 1 st in next st. K3.
Rep last 2 rows to 23 (23-26-26) sts.
Next row: (WS-buttonhole row). P3. K2. yfwd. K2tog. Knit to end of row.
Next row: Knit to last 5 sts. K2tog. K3.
Next row: P3. Knit to end of row.
Rep last 2 rows to 12 sts, ending with a purl row. Cast off.
Sew Pocket to back. Sew top edge of Pocket Flap in position ½ inch [1 cm] above top pocket edge. Sew button to Pocket to correspond to Pocket Flap buttonhole.