Pamphlet also contains the pattern for a matching hat, separate Ravelry entry here.

Sizes: to fit chest / actual measurements
0-6 mo (chest size 16”/41cm) / (17.75”/45cm)
6-12 mo (chest size 18”/46cm) / (20”/51cm)
1-2 yrs (chest size 20”/51cm) / (21.75”/55cm)
2-3 yrs (chest size 22”/56cm) / (23.75”/60cm)
4-5 yrs (chest size 24”/61cm) / (25.5”/65cm)
6-7 yrs (chest size 26”/66cm) / (28”/71cm)

Yarn Requirements: DK weight, 50g balls
MC: 2 (2, 3, 3, 3, 4) balls
CC: 1 ball all sizes

Also Needed:
5 (5, 5, 6, 6, 6) buttons