Have you heard of "vanity sizing", or "size inflation"? That's when articles of clothing are (sometimes much!) larger than the nominal sizes indicated on their labels. In most of the USA, clothes are bigger than the labels say. But, not everywhere. In some places, it appears, nominal sizes are ambitious, rather than modest: If you've got a head, a firm named for (but not actually located in) one of the Twin Ports (Duluth, Minnesota & Superior, Wisconsin) wants to sell you a size "XL/2XL" hat, with the caveat that:
Do these headwear purveyors think their size-M customers will leave their "XL/2XL" hats out, labels visible, so that their friends will think they're smart people with big heads?