When in Paris, do as the Parisians do: drink espresso, eat croissants, and definitely channel that effortlessly cool style all French women seem to be born with. You know the one we're talking about: It's that I-got-dressed-in-five-minutes-and-look-absolutely-awesome look that we all aim to have. With Paris Fashion Week just behind us, we've stolen some of the best French-girl style essentials for spring. And, to be clear, we fully plan to spend the entire season dressed head-to-toe in these…