I had to make some changes because the hat was too long for teen/adult, but otherwise it turned out great. Crochet Chevron Winter Hat plus Bonus free patterns Pattern no longer on craftsy, but can be found on ravelry.
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.