Measurements
To fit chest
61 66 71 76 cm (24 26 28 30 in)
Back length from shoulder
28 33 38 43 cm (11 13 15 17 in)

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

Materials
Teddy Classic Aran
2 2 3 3 X 100 gram balls
Teddy Vanguard Aran
2 2 2 3 X 100 gram balls
1 small ball of contrasting colour
4 buttons.