Step 7Trim the circles
Trim triangles out of the seam allowance, all the way around the circular seams. The points of the triangles should be as close to the seam as possible, without cutting through it. See the photos for an example.
The triangles will allow the seam allowance at the brim to stretch out to the right size and they also will reduce the amount of cloth bunched up in the seam at the crown of the hat.
If you have a fabric that unravels a lot and will fall apart, you can make slices in the seam allowance, instead of cutting away triangles. This method works better for areas that need to stretch, and not as well for areas where cloth is bunching up.
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