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!
I don’t see how most men would even find that out. Underwear is too intimate of a topic to open up about to the opposite sex.
Maybe for friends but not for spouses.
Maybe for you but not for others.
I talk to my husband about this stuff because it’s just funny to watch him react to it.