"L'Art de Vivre" - the art of living, is a French idiom and a way of life for the French. Of course, it is best reflected in the way they do their shopping and where and how they do it.
The weekends, for instance, are often dedicated to relaxing strolls in street markets usually combined with a light meal accompanied with wine.
The same street markets that are there for hundreds of years, as are a lot of the famous shopping malls and department stores the city abounds. Specialized stores, from fashion to books, from food to home accessories; all with years of expertise and dedication behind them, are also a common sight.
Take the time to look for them, even if just for the cultural experience. It's a great way to get a glimpse at this way of life, not to mention the great presents you'll be back with.