From the Knit Rowan website:

This pattern is designed by Lisa Richardson and features a jumper and a beret, both using the eye-catching diamond colour work. The jumper, completed in Felted Tweed, uses intarsia techniques for the stunning striped colour work. The beret uses Felted Tweed Aran and can be used for a much more subtle effect using neutral shades for an accessory that will add style to any outfit.

Yarn information
Photographed in Rowan Felted Tweed Aran
A - Clay 777
2 skeins
190 yards

B - Granite 719
2 skeins
190 yards

C - Carbon 759
1 skein
95 yards