5 buttons needed.
Pockets are optional.

Sizes available:
81, 86, 91, 97, 102, 107 cm. (32, 34, 36, 38, 40, 42 in.)

Length of back from top of shoulders:
46, 47, 48, 52, 53, 54 cm. (18, 18.5, 19, 20.5, 21, 21.5 in.)

50g balls needed:
With pockets: 4, 4, 5, 5, 6, 6
Without pockets: 4, 4, 4, 5, 5, 6