Here are the Fortuny links. When I traveled to Venice, I had no idea there was a Fortuny museum there, alas. Venice, like Paris, was one of those cities which lived up to its billing. San Francisco always has, as well. Without more ado, some great Fortuny links, many with mentions of Proust.
Mariano FORTUNY Y MADRAZO: http://www.senses-artnouveau.com/biography.php?artist=FOR
Fortuny in Wikipedia: http://en.wikipedia.org/wiki/Mariano_Fortuny_%28designer%29
Fortuny Museum in Venice:
The Fortuny gown: http://www.chick.net/proust/fortuny.html
Fortuny museum photo: http://www.flickr.com/photos/kevharb/3309836553/in/photostream/