BACK TO START An offshoot of fall's punk rock movement, bondage-inspired gear walked the spring 2009 catwalks of Stella McCartney, Yves Saint Laurent and Thakoon. Our fave (and every other editor's must have), the caged bootie at YSL is the perfect inspiration point for any aspiring S&M wannabe..   WHAT: High waisted scribble pencil skirt WHERE: Express HOW MUCH: $59.50   WHAT: Bandolino elastic strap wedge WHERE: Piperlime HOW MUCH: $69   WHAT: Bondage jeans by Boutique WHERE: Topshop HOW MUCH: $125   WHAT: Jersey print bodycon dress WHERE: Topshop HOW MUCH: $80       BACK TO START