You know, this is just one step away from someone making x-ray goggles
A image-to-skeleton pipeline might even be useful for 2D sprite rigging.
This is actually technology we already have today. You wouldn't want X-ray goggles, but infrared "goggles" would do the job just fine. Like X-rays, infrared light will pass right through clothes; unlike X-rays, it won't pass through skin.
Hook up an IR camera to a VR headset and you're there.
If an ai can reconstruct a view of the far side of something from data like the near side view and the shadows & other effects on the surrounding environment, then it can do the same thing to reconstruct a view of what's underneath clothing, theoretically, which may be reasonably restated as eventually.
This is actually not something that people want. The body within clothes is generally constrained by them in ways that look odd if you can't see the clothes; what people really want is to see what someone would look like if they were naked, not what they would look like if their clothes were invisible.
Would be super creepy though.
You're not thinking evil enough. Provide app for free, then use face recognition to allow people to pay to look better naked through the app.