"Vulgar" Fashion

The art exhibition "The Vulgar: Fashion Redefined" in London has recently been announced, and it raises a number of questions. Firstly, what is vulgar? What does that even mean? The dictionary defines vulgar as "lacking sophistication or good taste; unrefined." This seems like a bad thing, and vulgar is usually used with a negative connotation, but this show plays with the idea of the importance of vulgarity in fashion. They ask the questions, "what is vulgar? Are different things vulgar to different people? Is Vulgarity in the eye of the beholder?" It's based around the idea that fashion rules were made to be broken, and must be to redefine it, and I agree.