That's great for you if you don't care, but I do. It would still be someone seeing my character wearing a fashion disaster instead of the (perfectly non-offensive) outfit I picked out for them.
And you do realise that there are a number of genuine leveling gear items that could be described as speedos, like subligars and Shisui gear?
The "male counterpart" to female gear doesn't get campaigns asking for it to become usable on females, because it probably is already - including the Gambler set that is counterpart to the bunny suits. The Sailor Shirt (most often used by female characters) is meant to be a counterpart to the Spring Dress. The Thavnairian bustier is female-only but the bolero is unisex. Likewise for the Bridesmaid's dress (female) and Best Man's suit (unisex). Male FF character outfits are given as veteran rewards to both genders.
To echo some other people here - if you really cannot stand the sight of people in silly costumes, and only want to see them wearing "proper" setting-appropriate gear, this is probably not the game for you. You may have better luck with squadrons or the upcoming trust system, but as long as you are participating in multiplayer, you will inescapably come across more people wearing outfits you can't bear to look at. You will never be able to blacklist them all, and the real gear beneath their glamour might be just as terrible if you could see it.
Either you learn to cope with it, or you will have a very miserable time playing this game.