Crochet symbols & directions chart from Craftsy. Good article to read if you don't know how to crochet from charts. It's really a simpler way to work than from written instructions and it allows you to use all those gorgeous Japanese and Russian patterns!
Basic DC Circle Pattern - The double crochet hat pattern has been around for eons. It is also a standard mandala pattern as well. Once you hit the circumference in increases then just do rounds of dc in each stitch for a deep as you want the hat.