[ Ссылка ] You can download the template on two A4 sheets, and glue the two halves.
The crown itself can be sewn from eco-leather, any natural materials or synthetics of low extensibility. The fabric should not be transparent or highly stretchable. If the fabric is not dense enough, you can glue it with adhesive woven interlining fabric. I used a plastic flexible folder for documents to make the inner base. You can take sheet plastic, which is used in lamination, 0.7 mm will do.

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