Pattern also includes instructions for a matching hat (separate Ravelry entry here).

Sizes: to fit chest / actual measurements
0-6 mo (chest size 16”/41cm) / (18”/46cm)
6-12 mo (chest size 18”/46cm) / (19.75”/50cm)
1-2 yrs (chest size 20”/51cm) / (22”/56cm)
2-3 yrs (chest size 22”/56cm) / (24”/61cm)
4-5 yrs (chest size 24”/61cm) / (25.25”/64cm)
6-7 yrs (chest size 26”/66cm) / (27.5”/70cm)

Yarn Requirements: 50g balls
MC: 3 (3, 4, 5, 6, 7) balls Snowflake Chunky
CC: 1 ball Snuggly DK (all sizes)

Also Needed:
1 button