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Hat size

Your fitted hat size is your head's circumference divided by π: 22½ in (57 cm) is a 7⅛, a medium. Measure about a finger above the ears and eyebrows; between sizes, go up. Letter sizes vary by maker, so each hat's own chart wins.

How to use it

  1. Wrap a soft tape around your head about a finger above the ears and eyebrows.
  2. Read the inches or centimetres.
  3. See your fitted size and letter size; between sizes, go up.

Pieces that fit

Buy now goes straight to checkout with just that piece. Each piece's own page has its full details.

More instruments

A general guide. Brands cut and finish differently, so each piece’s own size chart and details win.