TT2,
If your, pleasant enough, 21 year old nephew to get pissed at a party wearing a Nazi uniform, I doubt very much that anyone would care, let alone publish it in a newspaper. It would not affect his opportunity to join the military, nor, I suspect, would it (in the UK) see him in court. But then again, I suspect that may have something to do with the identity of his granny.
Duncs