I say if you can't tell the difference between navy blue and black, particularly for clothes, no one else will. Weird, though, to hear navy described as "a shade of black" when IMHO there's no shades to black; it's absolute. Though there is a sort of pale black/darkest charcoal gray when you wash and dry a black item many, many times.

So many suspicious things sent via the Internet. I had one claiming I was being called into court. Nice try, people, but one word was spelled wrong and I know the gov'ts still send all that stuff via snail mail.