I love little tailors shops like this called Liverano & Liverano in Florence. They sell a little ready-to wear but the majority of their business is still done with tailored garments.
I love the fact that the gentleman doing the work seem to be as well dressed as their potential customers. I think that says something about the pride they have in their work and their craft.
For a great sartorial Florence shopping experience buy something, anything, at Liverano & Liverano then go around the corner to the original Santa Maria Novella and spend just as much on colognes, soaps,and creams.