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Very Nice work!!! It looks like fun. Do you have a basic pattern for you hat?
I just use a simple double crochet worked in a circle. And size it according, but here is a similar tutorial for what I do. I use a HDC in the first round and on the last 2-4 rows depending on the size of the hat. Hope this helps. http://www.youtube.com/watch?v=Kr2SPHk6wHU