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!
Honestly even Imperial would help at this point. Clothing sizes, in general, are based on basically clouds and dreams and vary wildly by brand or even by model.
I just wish the world standardized. I don’t care how. As long as it’s standard.