I am not sure if it's actually illegal but it's certainly frowned upon. You can wear what you like, as small as you like, as long as there is something there preserving your modesty, even if very little is left to the imagination. As I understood, from good carioca (people from Rio) friends, it's very 'low class' to be topless and have a 100% tan. That's something for the ladies of the night...

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