Tension: first 3 rows = 1 inch diameter
Measurements: side piece 4.5 inch, diameter 5 inch

From Pattern:
Brimless Buckram Hat Shape of contrasting color, 22.5 inch in circumference and approx 7 inch in depth or, if preferred, a Hat Shape of the above dimensions to be covered with a piece of fine taffeta or silk in a contrasting color.