You will need a cable needle.

You will also need 9 buttons. Rowan used # BN1108 from Bedecked in the UK.

Finished measurements:
Bust circumference - 38.75(42.75, 46.75, 50.5, 54.5)“ 98.5(108.5, 118.5, 128.5, 138.5) cm
Finished length - 38.5(39.25, 40.25, 41, 41.75)” 98(100, 102, 104, 106) cm
Sleeve to armhole 17.75(17.775, 18,18, 18)“ 45(45, 46, 46, 46) cm

Yarn used:
Rowan Moordale
Shade 008 Blue Moor - 10(11, 12, 13, 14) hanks