Here's an outlet shopping center built along the same style as a typical outlet in the US, based on a village. The number of shops there are respectable, I'd say something like 30-40 ish, definitely not as big as the 100 shop outlets in New York etc. Its located not too far from Euro Disneyland and I believe that you can take an RER over there as well. We drove this time, and its about 30mins from downtown Paris.
Interesting? Yeah, for me at least, Puma and Timberland as usual, but surprisingly this is the first time I've been to an outlet and didn't buy a single thing. Prices are about the same as in the US, but just substitute the USD into EURO, and you're done (summary: 30% more expensive by today's currency rate). Before you plan, there's another outlet closer to Paris.
Coordinates 48.85294N 2.78210E
Address La Vallée Village 3 Cours de la Garonne 77700 Serris France