Can You Wear Black, Red (Or Even White!) to a Summer Wedding?

The idea of a fashion taboo seems quaint in this age of informality and individualism. White after Labor Day? Been there, done that. Jeans every day, every way, everywhere? Ditto. You get the idea. Yet there still is a subject that arouses passion and discord even among the fashion cognoscenti: Is wearing white--or black or red--inappropriate if you're a guest at a wedding? Now, wedding dresses weren't always white, and in some cultures they still are not. It was Queen Victoria, who married Prin...