From Memorial Day to Labor Day, you may wear white shoes. Not before and not after. As a command, the White Shoe Edict should be clear and simple enough. Do not violate it. In a society in which everything else has become relative, a matter of how it makes you feel, a question between you and your conscience, and an opportunity for you to be really you, this is an absolute.
Judith Martin (1990). “Miss Manners' Guide for the Turn-of-the-Millennium”, p.149, Simon and Schuster