This style is a easy fitting boxy shaped sweater. It is knitted in a plain stocking stitch with purl stripes ever 20 rows. This is an effective way of creating a plain sweater with some textured interest but is still easy to coordinate with many outfits.

The sizing is-

Small
to fit Bust 88cm / 34.5”
Medium
to fit bust 92-98cm / 36-38.5”
Large
to fit bust 104-109cm / 41-43”

You will need the following number of balls for this sweater-

Romney DK from Romney Marsh wool, 500 (550, 600)g

This yarn also is available in a beautiful natural white, which I would recommend.