With buttoned opening at the back.

There is a pattern for a DK version in the same pamphlet.

Measurements
To fit chest 22, 24, 26 in
Actual measurements 24, 26, 28 in
Length from back neck 12½, 14, 15½ in
Sleeve seam 8, 10, 12 in

Requirements
6, 7, 8 X (1oz?) balls
Stitch holders
3 buttons.