Measurements
To fit chest sizes
40, 45, 50 cm (16, 18, 20 in)
Finished measurement
45, 50, 55 cm (18, 20, 22 in)
Length to shoulder
21, 26, 30 cm (8¼, 10¼, 12 in)
Sleeve seam
13, 15, 17 cm (5, 6, 6¾ in)

Each pattern has its own set of recommended yarns. The following is from the version for Dalesman yarns, which is not at the moment in the ravelry database.

Materials
Dalesman Double Knitting
2, 3, 3 X 40 gram balls
or
1, 1, 2 X 100 gram balls
4 buttons.