Summary
A cap sleeved jumper with circular, ribbed yoke which fastens at the back

The original pattern was for four sizes: 32” to 38” bust. The blog post gives the stitch counts (via a google docs spread sheet) to grade it up another 4 sizes: 40”, 42”, 44”, and 46” bust

Measurements (from original pattern)
Bust 32”, 34”, 36”, and 38”
Length 19.5”, 20.5”, 21.5”, and 22”

Gauge
7.5 stitches and 9.5 rows to 1 inch using 3.25mm US 3 needles over stocking stitch

Materials
5, 5, 6, or 6 oz Marriner’s Heritage 3-ply in blue
1 oz Marriner’s Heritage 3-ply in white
4”, 4”, 5”, or 5” zip