You will need 5(5, 6, 6) buttons. Rowan used #BN1994 from Bedecked in the UK.

Finished measurements:
Chest circumference - 224.5( 26.5, 28.5, 31.5)“ 62(67.5, 72.5, 80) cm
Finished length: 16.25(17.5, 19.25, 21)” 41(44.5, 59, 53.5) cm
Sleeve to armhole: 4.775(5, 5.5, 6)“ 12(13, 14, 15) cm

Yarn used:
Rowan Baby Cashsoft Merino
A. 112 Denim - 1(1, 2, 2) balls
B. 108 Sea Green - 2(3, 3, 4) balls
C. 109 Mint - 2(3, 3, 4) balls