Additional Yarn Info Patterns calls for both Rowan Big Wool (for the body) and Rowan Biggy Print (for the contrasting collar).
All sizes will need 2 skeins of Rowan Biggy Print at 100 gm each. In addition, XS and S will need 3 skeins of Big Wool, M and L will need 4 skeins, and XL will need 5 skeins.

Rowan rates this pattern as “easy, straight forward knitting.”