You will need 4 buttons.

You will also need a circular needle in both sizes US 3 (3.25 mm) and US 4 (3.50 mm) at least 48” (120 cm) long

Finished measurements
Bust circumference: 62.5(66.25, 70.5, 74.25, 78.25)“ 159(168.5, 179, 188.5, 199) cm
Finished length: 24.5(25.25, 26, 26.75, 27.5)” 62(64, 66, 68, 70) cm
Sleeve length to dropped armhole: 13.5(13.5, 13.75, 13.75, 13.75)“ 34(34, 35, 35, 35) cm

Yarn used:
(both yarns are held together)
Rowan Summerlite 4Ply
A. 417 Pure White - 9(10, 10, 11, 11) balls
Rowan Kidsilk Haze
B. 612 White - 8(9, 9, 10, 10) balls