STITCH NATION by Debbie Stoller™ “Washable Ewe”: 1 ball 3540 Currant
Also available at the Red Heart website here.
Please see this blog post for a video of the stitch pattern for this hat.
Although this hat is labeled as having a skill level of easy due to the definition at CYCA, please note that it requires a more intermediate level of stitching or at the least, a very adventurous crocheter. There is a lot going on in each cluster and it requires a lot of patience to make the stitches when learning. But, once learned, it moves very quickly and turns out to be easier than at first thought.