You will need 5 buttons approximately .75” (2 cm) wide.

Finished measurements:
Bust circumference: 42.25(46.5, 50.5, 56, 59, 62.25, 66.25, 71.75, 74.75)“ 108(118, 128, 142, 150, 158, 168, 182, 190) cm
Finished length: 22.75(23.5, 24.5, 25.25, 26, 26.75, 27.25, 28, 28.25)” 58(60, 62, 64, 66, 68, 69, 71, 72) cm
Sleeve to armhole: 16.5(16.5, 16.5, 16.5, 15.25, 15.25, 15, 15, 13.75)“ 42(42, 42, 42, 39,39, 38,38, 35) cm

Yarn used:
Rowan Denim Revive
Shade 210 Cream - 10(11, 11, 12, 12, 13, 13, 14, 14) balls