There is no dress code when going to most restaurants but you might receive some funny looks if you show up in sweats. Dressing well is respectful and you'll want to try to blend in with the locals.
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You may want to bring some lightweight clothing like a dress, or a nice shirt with shorts. Keep in mind some places you visit in Florence (like the Florence Duomo) have a dress code. Typically, the dress code is to make sure you have your knees and shoulders covered.
For the majority of places, such as museums, beaches, and stores, there are no restrictions on what you can wear. Many tourists and locals will wear shorts to these places when the weather is hot. At churches and the Vatican, you can only enter if your knees and shoulders are covered and you aren't wearing a hat.
“Dress Code” for visiting ChurchesShorts are not allowed for men or women; tank tops, bare shoulders or short skirts are not permitted. Just make sure your shoulders and legs are covered so if it's a hot day, bring a scarf or shawl to throw over your shoulders or your hips.
The Leaning Tower of Pisa has a dress code for visitors.The dress code prohibits bare shoulders, short shorts, and short skirts. To be permitted to go inside, shoulders must be covered by a scarf or jacket before entering.