Worked in one piece to armholes.

Measurements
To fit chest
41, 46 cm (16, 18 in)
Length from back neck
25, 27 cm (9¾, 10¾ in)
Sleeve seam
13, 14 cm (5, 5½ in)

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
4, 5 balls
Superwash (machine washable)
4, 5 balls
Super Pure New Wool
4, 5 balls
Studleyknit
4, 5 balls
Petspun Nylon
4, 4 balls
Serenade
4, 5 balls
1 Ball of contrast
STUDLEY BABY QUICK KNITTING
Baby Supreme
3, 4 balls
1 Ball of contrast
1 button.