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...Now I know that Milan banned this poster from a French Fashion house for religious reasons...
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All major Italian fashion designers have their main ateliers and shops here: Giorgio Armani, Dolce&Gabbana, Dior, Fendi, Gucci, Kenzo, Krizia, Prada, Valentino, Versace, Vuitton or Zegna.
Fashion District in Italian is "Quadrilatero della moda"