Gabrielle Chanel never married, so Bruno Pavlovsky, the impish but unflaggingly correct president of fashion at the company that bears her name, refers to her without fail as “Mademoiselle Chanel.” His observation of etiquette seems more and more incongruous the further you get into the salons of Gabrielle Chanel: Fashion Manifesto, a major exhibition that has just opened at London’s Victoria & Albert Museum.
Outside France,…