You will need 4(4, 4, 5, 5, 5) buttons. Sirdar used their buttons #B5611-0904

Finished measurements:
Bust circumference: 45.75( 50, 54, 58, 61, 63.75)“ 116(127, 137, 147, 155, 162) cm
Finished length: 21.25(22, 22.75, 23.75, 24.5, 25.25)” 54(56, 58, 60, 62, 64) cm

Yarn used:
Hayfield Bonus DK
Shade 597 Sand - 3(4, 4, 4, 5, 5) balls