You will need a cable needle

You will need 7 buttons. Rowan used #BN1564 from Bedecked in the UK.

Finished measurements:
Back width: 17.5(20, 21.5, 24, 25.5)“ 45(50, 55, 60.5, 65) cm
Finished length: 20(20.5, 21.5, 22, 22.5)” 50.5(52, 54, 56, 57.5) cm
Sleeve to underarm: 17.5(17.5, 18, 18, 18)“ 45(45, 46, 46,46) cm

Yarn used:
Rowan Alpaca Soft DK
A. Trench Coat #202 9(10, 11, 12, 13) balls
B. Toffee #203 - 1 ball for all sizes