The French Open in Paris is an awesome event. How lucky you are to be going to watch great tennis but visit Paris at the same time. Think casual chic and check the weather before you pack. Weather can vary in June. On average it can be 60 degrees to 75 degrees so you need to think layers. For cool days or evenings at the French Open athleisure, jeans or tailored lightweight trousers are perfect. For warm days cotton Capri pants (maybe shorts) will be comfortable. Bring a variety of tops that work with your bottoms, comfortable shoes / sandals, a lightweight jacket and sweater. Be sure to have a hat, sunglasses and sunscreen. A lightweight raincoat or poncho and umbrella for rainy weather is advisable. Unless you are invited to a special event(s) just bring something for evenings out that you would wear out to dinner at home. Fashion in Paris is similar to what it is in US cities. Most women don’t get dresses up unless they are going someplace very special.