Here are two examples of Red Heart's Waves-A-Head Crochet pattern. The gray hat is using Bernat's Super Value yarn. The yarn is deliciously soft and beautiful at a great price point. The hat is a little long, but you can actually flip it up for a different look and it still looks cute long. The bright blue hat is using Vanna's Choice yarn. There was not enough yarn in one skein to finish the pattern so it's a few rows shorter. The fit is still great though. The effect of the raised stitches is really cool. It looks even better in person.
You can find the free pattern online here: