Sales
Hello
The "oficial" sales seasson is 05/01/2017 to 05/03/2017
Which shops will have sales, for how long, how much etc is up to each individual shop to decide.
Which shops depends on what exactly you are looking to get. The cities main shopping streets, starting at the train station, going to the Duomo and then to Signoria Square from there, are where you will find the main, high end and luxury fashion shops.
Hope this helped,
Leonardo