Implicating midriff → clothing
Link to implication

Reason:

TheGreatWolfgang said:
Implicating midriff → clothing
Link to implication

Reason:

Technically, the midriff is a part of the body, the abdomen between hips and ribcage, and not an article of clothing.

The wiki describes it as "images or animations that depict the character wearing clothing. But none of the clothing is covering their belly or upper hips." It would be impossible to have this without clothing, so the implication is still valid.

Denied. It would almost work really well, but it both has a high rate of mistags (nudes shouldn't have it) and there are cases where you can have an exposed midriff but not actually because of clothing. Example:

post #595725

There are also cases where it might be because of armor or something similar that functions like clothing, but actually doesn't really fit in clothing (think armor).

Either way I'm going to go ahead and go through them manually and see what hasn't gotten tagged with clothing yet, remove any nudes tagged midriff, and see what's left after that.