I’ve been wondering this for a while and when I noticed that eyewear is mysteriously exempt from the apparently pointless division of the sexes for attire it made this distinction seem even more arbitrary so I’m assuming there’s some hidden or technical reason I’m not aware of.
Most items have a male and female counterpart anyways, but this division means that it’s twice as hard to find a cosmetic you’re looking for since there’s only a roughly 50% chance your character will be able to wear any item. When you get cosmetic rewards from promo codes or from Project Discovery you get two items, one for each gender. I know I can just pass off those items to an alt, and one of the characters on my account is a man specifically just so I can offload all my duplicate cosmetics onto him, but it just seems a bit awkward.
I understand that a lot of people who play EVE are older and wealthier (ergo, more conservative) so in a more toxic environment I could see CCP catering to the sensibility that gender is extremely important and that everything must be perfectly divided, but if your demographic thinks there really needs to be “male” and “female” baseball caps I don’t know why you’d even bother to make female avatars in the first place.