Steer clear of menswear clothing. For example, dressing in baggy jeans and track clothes will make you look like "one of the boys", but not a potential girlfriend. Instead, opt for the skinny jeans that are made for your body type, and wear track clothing made for women at your workout session.
Stock up on miniskirts and bright tights to make the most of your great legs. They will also add more shape to a straight body.