You will need

V Neck Cardigan
12in Chest - 1 Ball
14in Chest - 1 Ball
16in Chest - 1 Ball
18in Chest - 2 Balls
20in Chest - 2 Balls

Round NEck Cardigan
12in Chest - 1 Ball
14in Chest - 1 Ball
16in Chest - 1 Ball
18in Chest - 2 Balls
20in Chest - 2 Balls

Hat
12in Chest - 1 Ball
14in Chest - 1 Ball
16in Chest - 1 Ball
18in Chest - 1 Ball
20in Chest - 1 Ball

3.25mm and 4mm Needles
3 (3 : 4 : 4 : 4) Buttons for V Neck Cardigan
4 (4 : 5 : 5 : 5) Buttons for Round Neck Cardigan