I'll note in advance that I'd be perfectly fine getting rid of fanservice altogether. But in the spirit of compromise, I feel like this problem can be easily solved at the design level. As esports becomes more prolific and it becomes clear that your game might be exposed to bigger audiences that might want something more traditional or conservative, classify outfits in one of two categories: Everything mode and Family Friendly mode (or something more clever than that, I'm not really an ideas man). Basically, anticipate that this might air on network television or something similar at some point and have a toggle for it.
I honestly think toggles like this would just in general be beneficial and should be able to be handled at the client level for things like online so that if you're an adult who wants the sexy outfit playing against a kid whose parents would rather have a "cleaner" version for their kid to play, you'd see your sexy outfit and the kid would see an alt costume. This doesn't necessarily have to apply to just fanservice. Things like Mortal Kombat's violence and fatalities could also be handled this way.
I'm just spitballing here.
