With all the black and white themed weddings in the past few years I think many of the traditions regarding appropriate colors that we grew up with have been updated.
Just like nobody pays any attention to not wearing white before Easter or after Labor Day. Or only wearing certain color corsages for Mother's Day depending on whether your mother is still living or not.
Or only wearing a mum to a football game if it was given by a boyfriend (and not having it three or four flowers with twinkling lights and so heavy it all but pulls the clothes off the girls shoulder).
Ok I'll get off my soap box now!