A hat is an item of clothing which is worn on the head? a kind of headgear. Hats are differentiated from caps by being more elaborate; hats have a high crown, a brim, or both and are larger than caps. A hat may be either placed on the head or, in the case of some women's hats, secured with hat-pins (which are pushed through the hat and the hair). Many hats are intended only for men or for women, while other hats are fashionable for both sexes. Purveyors of men's hats are called hatters and purveyors of ladies' hats are called milliners.
When a hat is made, it is also blocked to a certain hat size. Generally, less expensive hats will be a named size such as small, medium, large, and extra large. Finer hats are more strictly fitted to a person's head and have a numerical size.
Metric hat sizes are simply the distance around the persons head measured in centimeters, usually rounded up to the next centimeter if the measurement falls between the centimeter marks.
American hat sizes are similar, but the distance is measured in inches and then divided by pi.
C=2\pi r and since 2r=d
\implies C=\pi d \implies
More specifically: the American numerical hat size is merely the average diameter of the head, determined by measuring the circumference of a person's head about 1/2 inch (1.3 cm) above the ears, dividing by pi, and rounding to the nearest centimeter or eighth inch. Also note that in the UK, an equivalent hat size is an eighth inch smaller than in the US. Some hats will stretch a size or two, but this can not be depended on for sizing purposes unless previous experience with the model of hat in question indicates that it will stretch.
Hat Size Shapes
The hat is also formed to be a specific shape. This is just as important as the size, as heads vary in length, width, and lumps! Some people have round heads, other elongated ovals. The shape can only truly be measured using specialised tools such as a conformateur. Shapes can include:
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This is an extract from Wikipedia, the Free Encyclopedia
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