There are separate instructions for size 24 - 32 inch (child and teenager) and size 34 - 42 inch (adult).

For back, front and sleeves “work as instructions given for Crew Neck version”.

The 3.75mm needles are used only for the final part of the polo collar.

Measurements
To fit chest
61, 66, 71, 76, 81, 86, 92, 97, 102, 107 cm
(24, 26, 28, 30, 32, 34, 36, 38, 40, 42 inch)
Length from back neck
35, 40, 43, 50, 56, 64, 66, 69, 70, 71 cm
(14, 15½, 17, 19½, 22, 25, 26, 27, 27½, 28 inch)
Sleeve seam
27, 31, 35, 38, 41, 43, 45, 46, 48, 48 cm
(10½, 12, 13½, 15, 16, 17, 17½, 18, 19, 19 inch)

Each pamphlet has a different set of recommended yarns. The following are from the Ladywood version.

Materials
LADYWOOD Double Knitting
Bri-Nylon/Acrylic
10, 11, 12, 14, 16, 19, 20, 21, 22, 24 X 20 gram balls
Acrylic
11, 12, 13, 15, 18, 21, 23, 25, 26, 28 X 20 gram balls
Shetland Pure Wool
4, 5, 5, 6, 7, 8, 9, 10, 10, 11 X 50 gram balls
Acrylic/Wool
4, 5, 5, 6, 7, 8, 9, 10, 10, 11 X 50 gram balls
Thermal D.K.
4, 5, 5, 6, 7, 8, 9, 9, 10, 10 X 50 gram balls
Pure Wool Crepe
6, 6, 7, 8, 9, 11, 12, 13, 14, 14 X 50 gram balls
Stitch holders.