By wearing the "bonnet rouge" and "sans-culottes" ("without silk breeches"), the Parisian working class made their revolutionary ardor and plebeian solidarity immediately recognizable. By mid-1791, these mocking fashion statements included the "bonnet rouge" as Parisian hairstyle, proclaimed by the Marquis de Villette (12 July 1791) as "the civic crown of the free man and French regeneration." On 15 July 1792, seeking to suppress the frivolity, François Christophe Kellermann, 1st Duc de Valmy, published an essay in which the Duke sought to establish the "bonnet rouge" as a sacred symbol that could only be worn by those with merit. The symbolic hairstyle became a rallying point and a way to mock the elaborate wigs of the aristocrats and the red caps of the bishops. On 6 November 1793, the Paris city council declared it the official hairstyle of all its members.