Summer Cardigan with Lace Diamonds

How to knit the Summer Cardigan with Lace Diamonds:
Sizes: US 4/6 (US 8/10) US 12/14
Finished Bust: 34/36 (38/40) 42/44 in
Materials:
600 (650) 650 g yarn (100% cotton, 153 yd/50 g); US 1½ (2.5 mm) and US 2½ (3 mm) circular needles, and 4 buttons.

Ribbing Pattern, US 1½ (2.5 mm) needles: work alternately 1 knit stitch, 1 purl stitch.

Lace Pattern, US 2½ (3 mm):
Work according to chart, which shows right-side rows only.
On wrong-side rows, purl all stitches and yarn overs.
Work rows 1–26 once, then repeat rows 23–26 throughout.

Gauge: 28 stitches and 36 rows = 4 x 4 in (10 x 10 cm).

Back:
Cast on 142 (156) 170 stitches and work 3.25 in (8 cm) in Ribbing Pattern, increasing 1 stitch in the last row = 143 (157) 171 stitches.
Continue in Lace Pattern.
At 12.25 in (31 cm) from the cast-on edge, bind off 6 (7) 8 stitches at each side for armholes, then on every 2nd row bind off 3 stitches once, 2 stitches 1 (2) 2 times, and 1 stitch 3 (2) 4 times = 115 (125) 133 stitches.
At 21.25 in (54 cm) from the cast-on edge, bind off the center 25 (31) 31 stitches for the neckline and finish both sides separately.
For neckline shaping, bind off from the inside edge on every 2nd row 5 stitches once, 3 stitches once, and 2 stitches once.
At the same time, for shoulder shaping, bind off at each side on every 2nd row 8 (10) 11 stitches once and 9 (9) 10 stitches 3 times = 22 in (56 cm) from the cast-on edge.

Left Front:
Cast on 68 (72) 80 stitches and work 3.25 in (8 cm) in Ribbing Pattern, increasing 1 (1) 0 stitches in the last row = 69 (73) 80 stitches.
Continue in Lace Pattern, beginning with 1 edge stitch and 7 stitches before the pattern repeat, repeat the pattern repeat throughout, end with 4 (8) 1 stitches after the pattern repeat and 1 edge stitch.
Work armhole and shoulder shaping at the right edge as for the Back.
At 8.25 in (21 cm) from the cast-on edge, decrease 1 stitch at the left edge 20 times on every 6th row.
For this, knit the 3rd and 2nd stitches from the end together.

Right Front:
Work as for the Left Front, reversing all shaping.
For neckline shaping, work the 2nd and 3rd stitches together with a slip-slip-knit decrease (slip 1 stitch as if to knit, knit 1 stitch, pass the slipped stitch over the knitted stitch).

Sleeves:
Cast on 60 (64) 68 stitches and work 3.25 in (8 cm) in Ribbing Pattern, increasing evenly 13 (9) 5 stitches in the last row = 73 stitches.
Continue in Lace Pattern.
For sleeve shaping, increase 1 stitch at each side 28 (29) 27 times on every 4th row and 0 (2) 6 times on every 2nd row, incorporating increased stitches into the pattern = 129 (135) 139 stitches.
At 16.5 in (42 cm) from the cast-on edge, bind off 6 (7) 8 stitches at each side, then on every 2nd row bind off 4 stitches once, 3 stitches once, 2 stitches twice, 1 stitch 15 times, 2 stitches 5 times, 3 stitches 3 times, and 4 stitches once.
At 22.75 in (58 cm) from the cast-on edge, bind off the remaining stitches.

Finishing:
Join shoulder seams.
Pick up 433 (439) 439 stitches along the front edges and neckline, work 1.5 in (4 cm) in Ribbing Pattern and bind off all stitches.
On the right front, make 4 buttonholes at a height of 0.6 in (1.5 cm) (= bind off 2 stitches and cast them on again in the following row).
Make the first buttonhole 7 stitches from the lower edge, and the remaining buttonholes at intervals of 18 stitches.
Sew side seams and sleeve seams. Set in sleeves.
Sew on buttons.