Mech> Well, sorry… X-rays don’t work quite like that. There’s a great deal of difference between soft tissue/clothes and bones. So if you want to lower the frequency of the X-rays you just end up seeing the clothes.
(Short version - lower the frequency enough and you get hard ultraviolet light... )
Wouldn’t it be easier to ask for the “I see naked people” superpower? Although…
To never need to go to the bathroom, the most disgusting
room in a house!!!
If you don't mean any super-powers,then I'd say to reach
a superior level of self-awareness and control over one's
emotions and thoughts. To know the exact limitations of
one's body and the surpass them through determines
mental and physical exercises and meditations.
Such a person can do marvels.