You will need six buttons to finish.

Finished Measurements:
Chest circumference: 42.25(57.5, 51.5)“ 110(121, 131) cm
Length to shoulder: 24.5(25.25, 26)” 62(64, 66)“

Colors used:
Rowan Hemp Tweed
A. #138 Pumice - 4(4,5) balls

Remaining colors - 2(2,3) balls per color
B. #132 Plum
C. #136 Granite
D. #134 Treacle