Measurements
To fit chest
16, 18, 20 inch (41, 46, 51 cm)
Length from back neck
9, 10, 11 inch (23, 25, 28 cm)
Sleeve seam
5½, 6, 7 inch (14, 15, 18 cm)

Each source has a different set of recommended yarns. The following are from the Studley pamphlet.

Materials
STUDLEY Double Knitting
Tricel Nylon Crepe or Supreme
5, 5, 7 balls
Superwash (machine washable)
5, 6, 7 balls
Super Pure New Wool
5, 5, 6 balls
Studley Knit
5, 5, 6 balls
Petspun Nylon or Swiss Nylon
5, 5, 6 balls
Serenade
5, 5, 7 balls
STUDLEY Baby Quick Knitting
Studleyknit
4, 4, 5 balls
Swiss Nylon
4, 4, 5 balls
Stitch holders
6 buttons.