You will need

Single Breasted Jacket
3-6mths - 1 Ball
6-9mths - 2 Balls
9-12mths - 2 Balls
12-18mths - 3 Balls

Double Breasted Jacket
3-6mths - 2 Balls
6-9mths - 2 Balls
9-12mths - 3 Balls
12-18mths - 3 Balls  

Tank Top
3-6mths - 1 Ball
6-9mths - 1 Ball
9-12mths - 1 Ball
12-18mths - 2 Balls

3.75mm and 4mm Needles
1 Button for Single Breasted Jacket
2 Buttons for Double Breasted Jacket
3 (3 : 4 : 4) metres of Ribbon for Single Breated Jacket
3 metres of Ribbon for Girls Tank Top