You will need 4 buttons.

Finished measurements:
Bust circumference: 42.5( 47, 50.75, 54.25, 58.25, 62.5)“ 108( 119, 129, 138, 148, 159) cm
Finished length: 22.75( 23.75, 24.5, 25.25, 26, 26.75) 58( 60, 62, 64, 66, 68) cm
Sleeve length: 17.75( 17.75, 18, 18.5, 18.5, 18.5)” 45( 45, 46, 47, 47, 47) cm