It is more accurate, but for most people it probably makes it more work. If most [Group A] need [Item A], it gets labelled that way so they can be sectioned that way. It probably would be better, especially for more uncommon shapes, to use measurements. But most people don’t want to do that for everything, they want an easy answer so they can go home. A lot of women I know have never bothered to get their bra size professionally measured, and that’s a readily available service that saves so much literal pain.

Reminds me of mens/womens deoderant. IIRC the real difference is that one is creamier (for body hair) and the other is powdery (for shaved skin). So sometimes men might want women’s deoderant or vice versa, and the labelling CAN obfuscate that.