You will need 6(6, 6, 7, 7, 7) buttons. Sirdar used their button # B5611-0522

Finished measurements:
Bust circumference: 42.5(47, 50.75, 54.25, 58.25, 62.5)“ 108(119, 129, 139, 149, 159) cm
Finished length: 22(22.75, 23.75, 24.5, 25.25, 26)” 56(58, 60, 62, 64, 66) cm
Sleeve to underarm: 5.5(5.5, 6, 6.25, 6.25, 6.25)“ 14(14, 15, 16, 16, 16) cm

Yarn used:
Sirdar Country Classic 4 ply
Shade 952 Navy - 7(8, 9, 10, 11, 11) balls