Are male models or do all models have to wear underwear on stage, or even not?

Basically, modeling is like this. Unless you are a graphic model, many graphic models still wear only underwear when shooting underwear ads.

Walking in underwear mainly depends on the proportion of the human body, which is the clothing that can best show the lines of the human body.

Walking naked on the stage should be human art.

At least wear underwear. I didn't see anything.