I know how so many people are in love the Alexa Chung's style but for me Sofia Coppola beats her hands down. She has a very chic french style and always looks amazing even when just running around town.
slim cut pants, shirts, cute shorts and fine knit jumpers
chic and simple dresses in interesting textures and prints (p.s. someone who can pull of a maternity smock dress and still look cool is a real style icon to me)