If you want a taller hat, make the rectangles 4 inches (10. 16 centimeters) wide instead. If you cut a bigger/smaller circle, then cut each rectangle so that it measures half of the circumference.
If you want a wider brim, cut the arches 4½ inches (11. 43 centimeters) wide instead. If you cut a bigger/smaller circle, match the inner curve of the brim to the length of your adjusted rectangle.
Repeat this step for the two inner fabric pieces.
Repeat this step for the two inner fabric pieces.
Repeat this step for the two inner fabric pieces.
Repeat this step for the two inner fabric pieces.
You don’t need to cut notches into the seam between the body and brim pieces.