In the land of fashion you are just spoiled for choice:
Florence, which has been the world's first place where a fashion show was set, offers several shopping malls!
The surroundings of Florence present The Mall (fashion brands outlet) and Barberino outlet.
Don't forget that even the city center of towns like Lucca and Forte dei Marmi offer great shopping opportunities.
In Liguria, Genoa is another great place for shopping together with Portofino and Santa Margherita. Otherwise you still may go to the Monaco in the French Riviera.