3 links have been added on this idea.
  1. Is a material like this possible? ” A lot of materials will not allow visible light through but will allow UV through, as UV is more powerful, just as X-rays can get through your muscles to your bones but visible light can not as easily.” – but no examples given.

  2. it would have to be made of a fabric with a band pass filter that blocks all wavelengths EXCEPT UV. Not impossible, but not a thing yet. As far as I know. Could be dangerous though, folks will be getting blasted by UV all day long without realising it. So there’s your cancer versus vanity gamble.