|Worn as a beret|
I knitted my sample in Sirdar Bigga, and it only used one ball of yarn. This yarn is a wool and acrylic mix that is now unfortunately discontinued, but any super chunky yarn that knits to the right gauge would also work. You could try Rowan Big Wool or Drift.
The pattern is available now on Ravelry - click the link in the pattern name at the top of this post.