You will need:

Striped Hat:
Main Shade:
4-6 years - 2 x 50g balls
7-9 years - 2 x 50g balls
10-12 years - 2 x 50g balls
Adult - 2 x 50g balls

Contrast Shade:
4-6 years - 1 x 50g balls
7-9 years - 1 x 50g balls
10-12 years - 1 x 50g balls
Adult - 1 x 50g balls

Plain Hat:
4-6 years - 2 x 50g balls
7-9 years - 2 x 50g balls
10-12 years - 2 x 50g balls
Adult - 2 x 50g balls

Hat with Pom Poms (including pom poms)
4-6 years - 3 x 50g balls
7-9 years - 3 x 50g balls
10-12 years - 3 x 50g balls
Adult - 3 x 50g balls

Hat with Contrast Turn Back:
Main Shade:
4-6 years - 1 x 50g balls
7-9 years - 2 x 50g balls
10-12 years - 2 x 50g balls
Adult - 2 x 50g balls

Contrast Shade:
4-6 years - 1 x 50g balls
7-9 years - 1 x 50g balls
10-12 years - 1 x 50g balls
Adult - 1 x 50g balls

- 1 pair of 10mm knitting needles,
- 1 pair of 8mm knitting needles.