Paris is one of the great fashion centres of the Western world, up there with New York, London, and Milan, making it a shopper's delight. While the Paris fashion scene is constantly evolving, the major shopping centres tend to be the same. High end couture can be found in the 8th arrondisement. In summer, there is nothing better than browsing the boutiques along Canal St-Martin, or strolling along the impressive arcades of the historic Palais-Royal, with beautifully wrapped purchases swinging on each arm. As long the husband isn't with you, who has to swing the bags for you... I guess. :)
A good note about Le Marais is that as it is a mostly Jewish neighborhood, most of the shops in Le Marais are open on Sundays. The stores in this area are intimate and boutique, manifesting as particularly "Parisian" style clothing stores. You will no doubt find something along each street, and is always well worth the look.
Other great areas to shop around in are around the area Sèvres Babylone (Métro ligne 10 and ligne 12). It is in this area you will find afore mentioned Le Bon Marchée 7th, particularly rue de Cherche Midi 6th. The area houses some of the major fashion houses (Chanel, Jean Paul Gaultier, Versace, etc) and also has smaller private boutiques with handmade clothing.
In the Quartier Saint-Germain-des-Prés, you can find a handful of vintage clothing shops, carrying anything from couture early 20th century dresses, to 70s Chanel sunglasses. Walking along Boulevard Saint-Germain, you will find major brands. However, if in search of eclectic finds, opt to walk the northern side of the Boulevard, especially along rue Saint André des Arts, where you can always find a nice café to stop in. The area south of Saint-Germain is just as nice, and comes with a price tag to match.
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Based on a work at Wikitravel.org & Traveldudes.org.