Since not every tournament will have all the DLC, I think you should limit to just alternate colors of regular costume.
Very few tournaments used bandages Mileena because she was an unlockable for kompleting the challenges. Hell, some tournaments didn't even have Quan Chi unlocked
I understand why they have to make that request, I get it.
But putting platform rules aside, I simply don't see any issue with those costumes in a tournament setting.
It's already an M rated game, played by adults, watched by viewers that likely play other fighting games which contain similarly ridiculous fanservicey costumes.
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I understand that some people are more sensitive about this kind of thing, but I've noticed that people are selectively sensitive about this kind of thing.
Very few tournaments used bandages Mileena because she was an unlockable for kompleting the challenges. Hell, some tournaments didn't even have Quan Chi unlocked