You will need

20in Chest - 3 Balls
22in Chest - 3 Balls
24in Chest - 3 Balls
26in Chest - 4 Balls
28in Chest - 4 Balls
30in Chest - 4 Balls

3.25mm and 4mm Needle
10 (12 : 14 : 16 : 18 : 20)in open ended Zip