There is a cardigan version of this design here.

Sizes: 1 (2, 3, 4, 5) 6, 7, 8, 9, 10

Measurements
Finished chest circumference (when fastened): 85.5 (95, 105, 114.5, 124) 133.5, 143, 152.5, 162, 171.5 cm / 34.25 (38, 42, 45.75, 49.5) 53.25, 57.25, 61, 64.75, 68.5”
Body length from underarm: 36 cm / 14.25” (customisable)
Armhole depth: 22.5 (22.5, 24.5, 25.5, 27) 28, 29, 30, 32, 33 cm / 8.75 (8.75, 9.75, 10, 10.75) 11, 11.5, 11.75, 12.5, 13”
Back neck width: 10 (12, 13, 13, 14) 14, 15, 15.5, 15.5, 16.5 cm / 4 (4.75, 5.25, 5.25, 5.5) 5.5, 6, 6.25, 6.25, 6.75”

The sample shown is size 2 worn with 5 cm / 2” positive ease at widest point of chest.

Yarn: John Arbon Textiles Appledore DK (DK weight, 250 m per 100 g skein)
Appledore DK is available in the US here.
3 (3, 3, 4, 4) 4, 5, 5, 6, 6 skeins / 245 (275, 310, 340, 380) 410, 445, 485, 530, 570 g
615 (690, 775, 850, 950) 1025, 1115, 1215, 1325, 1425 m / 670 (750, 845, 925, 1035) 1115, 1215, 1325, 1445, 1555 yd

The sample shown uses the shade Dufflin.

Gauge: 21 sts and 28 rows = 10 cm / 4” in stockinette on larger needle, worked flat, after blocking

Needles
3.25 mm / US 3 circular needle (or needle 1–2 sizes smaller than main needle )
3.75 mm / US 5 circular needle (or size required to obtain correct gauge)

Notions: Stitch markers, scrap yarn or stitch holders, cable needle, darning needle for sewing in ends, spare needle for three-needle bind-off, buttons x 6 (or more if adding extra body length).

The cardigan version of this design is available here.