You will need

24/26in Chest - 7 Balls
28/30in Chest - 9 Balls
32/34in Chest - 13 Balls
36/38in Chest - 15 Balls
40/42in Chest - 17 Balls
44/46in Chest - 19 Balls

8mm and 10mm Needles
2(2 : 3 : 3 : 3 : 3) Buttons