>>2877246I happen to be an expert on this subject. The first thing that would help is using a lora to assist. Even at low weights, this can help turn clothes into a painted surface:
https://civitai.com/models/456561/painted-clothes-ponyNext, even though it sounds contradictory use keywords you would use to describe things related to clothes but leave a clear outline. For instance: covered nipples, navel, impossible clothes. And most importantly, the tag is "painted clothes".
If I misread you and you just wanted bodypaint in general, enjoy this gen I made.