You will need a cable needle.

Finished measurements:
Chest circumference: 30.25(32.5, 35.25, 37.5)“ 77(82.5, 89.5, 95) cm
Finished length: 18(19.75, 21.25, 22.75)” 46(50, 54, 58) cm
Sleeve to underarm: 11.75(13.5, 15, 17)“ 30(24, 38, 43) cm

Yarn used:
Rowan Softyak DK
Shade 255 Albany - &(8, 9, 10) balls