The assignment for the Muggle Studies class was to knit something inspired by a muggle entertainment source (film, tv, etc). Sooo, I designed and knit a Grey's Anatomy inspired scrub cap.
It's a clever bit of shaping and careful use of reverse stockinette, and it worked out marvelously. Here's the free pattern link! CLICK HERE for PDF
I made myself the medium size, but if I had it to do over again I'd make the large.
Also, there are i-cord ties at the very back. But it's physically impossible to take a picture of the back of your own head with an iphone and a bathroom mirror.