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

Finished measurements:
Chest circumference: 20.75(21.5, 22.25, 22.75)“ 52.5(54.5, 56.5, 58) cm
Finished length: 8.75( 9.75, 10.75, 11.5)” 22.5( 24.5, 27.5, 29) cm
Sleeve to armhole: 5(5.75, 6.75, 7)“ 13(14.5, 17, 18) cm

Yarn used:
Rowan Cashsoft DK
A. 120 Anthracite - 2(2, 3, 3) balls
B. 106 Silver - 1(1, 2, 2) balls