More to explore:
Basic double crochet Circle Chart.
Crochet Cloche Hat - love the bow details, and I think this would make a great chemo cap!
Double Up Hat: free pattern
The single rib crochet stitch is super simple to do. If you can double crochet and chain you're in business to whip up some awesome crochet texture!
Magic Loop. In this method, you can crochet a large number of stitches and then close the middle, no more struggling to put 18 double crochets into a chain 4 ring. Great idea Yarntomato!
Rapunzel crochet hat, so cute for a little girl.
Turkey Crochet Hat
Crochet Pirate Owl Hat
crocheted flapper hat