Leanne Marshall, the Season 5 Project Runway winner (and Inhabitat designer crush), showed her eco-friendly Spring/Summer 2012 collection at New York Fashion Week on Saturday.  With her flirty and feminine collection of intricately constructed cocktail dresses and evening wear, Marshall successfully balanced on the fine line between youthfulness and elegance.  With billowy confections of hemp silk, bamboo jersey, and organic cotton, we fell in love with her ability to make a classic evening look seem young and fresh.  Click ahead to see our photos of the show!