DO dress a little nicer than you would in America. 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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Italians tend to dress simply and stylishly and in fitted rather than baggy clothing. Choose neutral colors like black, dark blue, beige, and white and pack button-down shirts and blouses; chinos; knee-length or below skirts; and a blazer or leather jacket if you're traveling in the shoulder seasons.
– The best shoes for Italy are the ones you can comfortably walk in. Sneakers are fine also in Italy, but again, maybe not in a fancy restaurant. So consider taking also some nice pair of shoes with you.
When deciding how to dress in Rome for an evening out, go for airy clothes, like dresses and skirts and loose shirts paired with sandals or espadrilles. Maxi dresses are always great – it's just too hot to have anything close to your skin.
When you travel in Italy, wear long, loose, comfortable skirts with flowing long-sleeved blouses. Short, tight skirts, shorts, and bare arms are not permitted in the many churches one might visit there.
Socks and sandals are very common in the US to the point it's almost a fashion statement. However, in Italy and most of Europe, it's extremely frowned upon and not stylish at all.