A square crown is one having a flat top, or one only slightly rounded,
with the sides slightly sloping in towards the top. A crown of this type
three or three and one-half inches in height would be at least one and
one-half inches smaller at the top than at the bottom. Any crown made
separately from the brim must be large enough to cover the headsize wire
on the brim at the base. To eliminate any slashes or seams in the side
crown, a paper pattern should be made. Following paragraphs explain how
this is done.