Measure once, measure twice then measure once more just to be sure!
Please remember that all of our hats are made to order and as such we cannot accept returns on the grounds of the hat not fitting you. Please measure carefully before ordering and there won't be a problem.
Using a soft tape measure, completely circle your head with the tape, placing it exactly where you want your hat to sit (normally this will mean about half a centimetre above your ear and across the mid-forehead). Pull the tape firmly, but NOT too tight. If the measurement falls just above the centimetre, choose the next size up. E.g. if your head measures 56.4cm select the 57cm hat.
From Philip's experience, all hats should be put on first by positioning the hat at the front of the head and then pulled to the back of the skull at the area of the occiput, for fitting and comfort, so that the relationship between the face and hat are not compromised...invariably the hat or brim should be in symmetry with the incline of the eye brow or eyelid, most often preferring the right eye.