Who owns fashion, anyway? It's not Mercedes Benz. During Fashion Week, the shows are a swirl of celebrities, heat-seeking baby bloggers, and petro-oligarch princesses. But on the sidewalks, behind the barricades, and in the open-air plaza at Lincoln Center, there's a much grittier scene that somehow says more about real New York style. A crush of fashion kids, tourists, design students, hangers-on, and groupies hang around the edges, hoping to get noticed. "We want to perform, too," said Romy, a designer visiting from Amsterdam who staged a "guerrilla fashion show," left, at Lincoln Center. "So we did it ourselves!"