You will need a cable needle.

You will also need nine buttons. Rowan used #A)454 from Groves & Banks.

Finished measurements:
Back width: 19.5(22, 23.5, 26, 27.5)“ 50(55.5, 60, 65.5, 70) cm
Finished length: 25(26, 27,27.5, 28.5)” 64(66, 68, 70, 72)“
Sleeve length to underarm: 17.5(17.5, 18, 18, 18)” 45(45, 46, 46, 46) cm

Yarn used:
Rowan Pure Wool Superwash Worsted
Color 112 Moonstone - 10(11, 12, 13, 14) balls