I like to work with newspaper or just scrap printer paper, because it is cheap and plentiful. It is also really forgiving because you can draw on it, easily cut it and tape it back together.
How I would approach it: start the pattern by measuring around my head, about the middle of where the crown would sit. Draw a line of that length on my paper to start the pattern, and then roughly draw the crown shape. I might compare it with a couple references and take some more measurements to get a more accurate shape. Then I would cut it out, tape it together and try it on. From there I would mark it up, cut and add to it until I get the right shape and a good fit – voila, pattern!
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