This undated photo provided by the Salvatore Ferragamo press office shows model Langley Fox Hemingway holding a Fiamma hand bag. Perhaps the ''It'' bag's star just burned too bright. Those must-have handbag wonders, which flew out of stores before dropping into sudden oblivion, have given way to something more enduring: signature bags. Iconic bags have been around since fashion fused with celebrity -- Hermes has the Birkin, Fendi the Baguette, Gucci the Hobo, and so on -- but now they are becoming a cornerstone of brand strategy, acting as a flagship item. These are bags so exclusive and enduring that they have become emblematic of the label they bear. Ferragamo has launched its own entry into the category this week, the Fiamma named for founder Salvatore Ferragamo's late daughter. (AP Photo/Salvatore Ferragamo press office, ho)