Boskular colourwork yoke jumper knitting pattern

Boskular is a colourwork yoke jumper, worked seamlessly from the top down. It features stranded knitting in two colours on the yoke, hem and cuffs. The neckband, hem and cuffs are worked in the contrast colour.
The design is inspired by the way tree branches and roots reach together in the woods, curving overhead and underfoot to create a pattern that is almost architectural, like gothic stained glass windows or Art Nouveau whiplash lines.

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

Measurements
Finished chest circumference: 83.5 (94.5, 102, 112.5, 123.5) 134.5, 145.5, 156.5, 163.5, 174.5 cm / 33 (37.25, 40, 44.5, 48.75) 53, 57.25, 61.5, 64.5, 68.75”
Body length from underarm: 35 cm / 13.75” (customisable)
Sleeve length: 41 cm / 16.25”

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

Yarn: Garthenor Organic Number 2 / Pentland (4-ply / fingering weight, 170 m / 186 yd per 50 g skein)
MC: 4 (4, 5, 5, 6) 6, 7, 7, 7, 8 skeins or 612 (680, 748, 816, 918) 986, 1054, 1156, 1190, 1258 m / 669 (744, 818, 892, 1004) 1078, 1153, 1264, 1301, 1375 yd
CC: 2 (2, 2, 3, 3) 3, 3, 3, 4, 4 skeins or 306 (306, 340, 374, 408) 442, 476, 510, 544, 578 m / 335 (335, 372, 409, 446) 484, 521, 558, 595, 632yd

The sample shown uses Garthenor Organic Number 2 in Shale as MC and Pentland in Willow as CC.

Gauge
22 sts and 30 rounds = 10 cm / 4” in stockinette in the round on larger needle, after blocking
24 sts and 30 rounds = 10 cm / 4” in colourwork pattern in the round on larger needle, after blocking

If you are unable to match gauge for the colourwork, you may need to go up a needle size.

Needles
3 mm / US 2.5 circular needle (or needle 2 sizes smaller than main needle)
3.5 mm / US 4 circular needle (or size required to obtain correct gauge)
Optional: 3.75 mm / US 5 circular needle (or size needed to obtain correct gauge for colourwork)