Go to Customer Office with receipts and passport and obtain Tax Free Form if you are a non EU resident and spend more than 154,95 euro in the same day.
Italy
Shop Tax Free in La Rinascente
Piazza della Repubblica, 4, 50123 Firenze FI, Italy.
P.za del Duomo, 20121 Milano MI, Italy.
Piazza Fiume, 00198 Roma RM, Italy
Via del Tritone, 61, 00187 Roma RM, Italy