Sandals are fine, and be sure to cover your knees, shoulders and cleavage to show respect. You will see others who do not do this, but you will be doing the right thing!
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A. Visitors are required to dress appropriately by covering their shoulders and wearing trousers/skirts that come below the mid-thighs. Hats, swimwear and costumes with promotional content or offensive/distracting designs are not allowed.
It's fine to wear casual clothes such as khakis, jeans, tennis shoes, and sandals to many restaurants in Rome. But remember that in Italy, modesty is key. You won't find Romans dining in shorts and tank tops, so keep this in mind for going out to eat, and again, for visiting the sites.
As a traveler, shorts in Europe are problematic for a few reasons. They are not allowed in most churches unless they cover the knee. They are not allowed in upscale restaurants.
Most Parisians do not wear sandals on the streets! Instead, you'll see most of them wearing sneakers or boots. So depending, on the weather, carry either a pair of sneakers or boots for roaming around the city. However, you can still pack one pair of sandals just to wear when you're in your hotel room if you'd like.
It's fine for your sightseeing outfits to be casual in Rome. T-shirts, jeans, tennis shoes, sundresses and sandals are all appropriate for any of the Rome sights, including Vatican City? and the Colosseum. You should be comfortable since so much of the best sight-seeing in Rome involves walking.