Measurements
To fit chest
46 51 56 61 66 cm (18 20 22 24 26 in)
Length (approx) from back neck
20.5 29 33 38 43 cm (10 11½ 13 15 17 in)
Sleeve seam
15 17.5 20.5 26.5 31.5 cm (6 7 8 10½ 12½ in)

Each source has a different set of recommended yarns. The following is from the King Cole version.

Materials
Big Value DK
2 2 2 3 3 100 gram balls
Happy Days DK
2 2 2 3 3 100 gram balls
Anti-tickle DK
5 5 5 6 6 50 gram balls
2 buttons
Stitch holders.