Thanks to c666d for the original idea!

This makes the upper buttocks visible in most clothes. It’s called butt cleavage in the fashion world and it is trained on a lot of different styles dress, a lot of open back, some cutouts and some low-rise designer pants. Thought most buttocks in the dataset are kinda small to my taste, it should handle various sizes with some help.

Not enough information? I’m kinda lazy, so please ask in comments below if you need something!