Prato has an ancient textile tradition and is specialized in realizing all types of high quality fabrics and clothing.
You can go factory shopping directly in the outlet stores to find great prices. You might also go shopping in artisan workshops, where you can buy typical products of the local textile industry, created by the skillful hands of craftsmen that follow a thousand years old tradition.
I suggest you visit the city center of Prato where you find a lot of fashionable clothing and accessories shops.
Among the outlets, you could consider Mazzoni Abbigliamento, very near the city center, in Viale Piave, 32, and Babylon Bus Abbigliamento, again in Viale Piave. Another one I suggest is Minimoda Abbigliamento: http://www.minimoda.com/
Enjoy your shopping!