>>41076708Nothing.
People keep using anime Misty as an example of a crop top, however, that thing almost never shows her navel in the actual series. It wasn't until SM came around when it actually showed her belly button.
As for Sonia, her design is just retarded. It feels as if the designers couldn't decide whether she was meant to be sexy or casual, so they wound up with that abomination instead.
I'm pretty sure Satoshi Yamamoto (Edgeventures artist) is going to find a way to add a belly button on to that outfit (even if it makes no sense from an anatomical perspective) in the same way he did with Elesa and Viola.