HAT SIZE GOES WITH SHAPE OF HEAD FOR STYLE AND SMILE
Each head has it’s own size, each its own particular shape. A hat may fit perfectly, but if its form, width, height and breadth do not harmonize with the shape of a customer’s skull and face, a discordant note seems to spoil the appearance of the wearer.
A hat must fit not only accurately, it must also conform nicely with the cranium’s contour to give maximum satisfaction.
HEAD SHAPES, SIZES
Head size is based on the circumference of the head. If a string is placed around a head and it measures 21.8750 inches and this circumference of the odd oval is made into a circle, the diameter of the circle would be 7 inches, the equivalent of a size 7. International hat sizes differ slightly. English sizes are based on the true diameter of a circle, while American sizes have a slight deviation. There is 1/8 difference allowed in some hat size charts.