Men of Lemmy, how old were you when you found out that bra cup sizes are not standardized in the slightest?
It's so bad that my fiancée has some bras that say she's a B cup and others that says she's a D cup. In order to go bra shopping, you have to actually try them on to find out if they fit.
If I had to try on underwear to see if they fit, I might not bother with underwear at all!
Men's clothing sizes are a little dumb sometimes but I can usually take a tape measure to my waist and correctly order pants. Your guess is as good as mine what the difference between "boot cut" and "relaxed fit" are, and I would swear T-shirt sizes have shrunk since I was a teenager. As in, I can compare a Medium I've had since the Dubya administration to an XL today. But getting fitted for a suit, they measure me in inches and the clothing is more or less sized in inches.
Women's clothing sizes have had two different ice pick lobotomies. Women come in a wider range of sizes and aspect ratios, women's clothing is pretty much universally designed to fit tighter, but on the rack they're given one meaningless size number. a 12 is bigger than a 10, who knows by how much, and there's nothing on the girl you can measure with a tape to get that number, and there is no standard here at all. Why they haven't revolted I have no idea.