You will need a cable needle.

You will also need 7 buttons. Rowan used #BN1365/30 from Bedecked in the UK.

Finished measurements:
Back width: 18(20, 21.75, 23.75, 25.75)“ 45.5(50.5, 55.5, 60.5, 65.5) cm
Finished length: 19.75(20.5,21.25, 22, 22.75)” 50(52, 54, 56, 58) cm
Sleeve length: 17.75( 17.75, 18, 18, 18)“ 45(45, 46, 46, 46) cm

Yarn used:
Rowan Moordale
Shade 004 Gooseberry - 6 (6, 7, 8, 8) hanks