You will need 7 buttons, approximately 5/8” (1.4 cm).

Finished measurements:
Chest circumference: 20.5(21, 21.75, 22.75)“ 52(53.5, 55.5, 57.5) cm
Finished length: 8.75( 9.75, 10.25, 11.5)” 22.5( 24.5, 26, 29) cm
Sleeve to armhole: 5(6, 6.75, 7.5)“ 13(15, 17, 19) cm

Yarn used:
Rowan Summerlite DK
Shade 472 Pink Powder - 3(4, 4, 4) balls