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) / (21.75”/55cm)
2-3 yrs (chest size 22”/56cm) / (24”/61cm)
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
Tank Top: 1 (2, 2, 2, 3, 3) balls
Waistcoat: 2 (2, 2, 3, 3, 4) balls

Sirdar: http://www.sirdar.co.uk/designs/babiesDesigns/waistcoatst...