Wearing a G-1 flight jacket off base?

What are the current regulations in regard to this? A friend of mine
in Chicago said while he was at lunch the other day he saw a Navy
officer in uniform and his G-1 at a fast food joint. He was suprised
to the see the flight jacket, because he was under the impression they
weren't allowed to be worn off base. I figure since the guy was in
uniform and the G-1 doesn't really get used in the air much anymore,
that it was fine to be wearing it.

Thanks,

~Michael