You will need 4 buttons. Rowan used style # A0478 from Groves and Banks in the UK. You will also need a cable needle.

Finished measurements:
Back width:17.5(19.5, 21.5, 23, 25)“ 44(49, 54.5, 58.5, 64) cm
Finished length: 16.5(17.5, 18, 19, 19.5)” 42(44, 46, 48, 50) cm
Sleeve to armhole: 8(8, 8.5, 8.5, 8.5)“ 20(20, 21, 21, 21) cm

Yarn used:
Rowan Kid Classic
Shade 847 Cherry Red - 6 (6, 7, 8, 8) balls.