Manolo says, here is the Manolo’s latest column for the Express of the Washington Post. Dear Manolo, Labor Day is this weekend, and I’m confused about the rule that prohibits the wearing of white after that date. Where does it come from and why should I pay attention to it? Miranda Manolo says, it has been two or more years since anyone has asked the Manolo about the white shoes and the Day of Labor, the fact which the Manolo takes as evidence of the final death throes of this old rule. Its origin lies in the ancient history of…