Hats size is usually generally measured in one of three different sizing scales; British, North American or European/Metric.
British hat sizes are given in an imperial measurement of the diameter of the head in inches. Sizes usually range from 6 1/2 to 8. North American hats use the imperial scale however measurements are an eighth of an inch larger than British hats for the same size hat. European hat sizes use the metric sizing standard which is a measure of head circumference given in centimeters. Metric sizes usually range from 52 – 64.
Pachacuti’s range of Panama and Felt hats use the metric or European sizing standard and thus when ordering Panama hats from Pachacuti it is best to give your hat size in centimeters. A conversion chart is given below to convert from British or North American imperial sizes to metric.