This is the Seamless Beaded Cancer Cap by Amy Depew. I was looking for a chemo cap pattern that incorporated beads to give it a fancier look than just the yarn by itself, and Amy's pattern was the perfect solution.
Amy also includes detailed instructions (including a video tutorial) for how to place the beads and get them to stay on the outside of the hat, which was very helpful. When you're crocheting in the round, those darn beads tend to want to slip to the inside of your work -- and we definitely don't want that to happen.