I'm not enough of a shopper to have ever counted on buying clothes in a new city. I do pack relatively light and generally have a little room for bargains I might come across. And if the exchange is favorable, some of what I bring will be older and not beloved - toss-able if I need even more space.
I've happened into off-price stores in Paris, not interested in going to the 'burbs, but the author of this is more on your wavelength: http://www.examiner.com/article/wher...d-depot-ventes.
Enjoy your trip!