You will need

Ribbed Slouchy Hat
4-6 years - 2 Balls
7-9 Years - 2 Balls
10 -12 years - 2 Balls
Adult - 2 Balls

Fairisle Helmet
4-6 years - 1 Ball in Main and 1 Ball in Contrast
7-9 Years - 1 Ball in Main and 1 Ball in Contrast
10 -12 years - 1 Ball in Main and 1 Ball in Contrast
Adult - 2 Balls in Main and 1 Ball in Contrast

Pull On Hat
4-6 years - 2 Balls
7-9 Years - 2 Balls
10 -12 years - 2 Balls
Adult - 2 Balls

Hat with Earflaps and Pom Poms
4-6 years - 2 Balls
7-9 Years - 2 Balls
10 -12 years - 2 Balls
Adult - 3 Balls

8mm and 10mm Needles
Stitch Holders for Helmet