You will need 5(5, 5, 6, 6) buttons. Sirdar used their buttons B5600-0058 for this design.

Finished measurements:
Chest circumference: 25.25(26.5, 27.25, 28, 29.5)“ 64(67, 69, 71, 75) cm
Finished length: 15(15.75, 16.5, 17.25, 18)” 38(40, 42, 44, 46) cm
Sleeve length: 11(11.75, 12.5, 13.5, 14)“ 28(30, 32, 34, 36) cm

Yarn used:
Sirdar Snuggly Replay
A. 100 Whizz Kid White - 4(4, 5, 5, 5) balls
B. 119 Good as Gold - 1 ball for all sizes
C. 116 Race Car Red - 1 ball for all sizes
D. 112 Leapfrog Green - use oddments from your stash