Even though you will be in Paris in the summer, the weather can surprise you. I nearly froze to death in July. Resist any and all temptations to bring a down-filled jacket! I agree with the previous poster about wearing black. Lots and lots of black. Dressy black & casual black. A black turtleneck is essential for the casual places & if you have leather jackets, this is the time to bring them along. You also want an inside pocket to stash the Michelin & a handbag large enough (but not too big) for the Paris par Arrondisement). French women do not apply their lipstick in public (they excuse themselves after the meal & freshen up).