Even if you have a proclivity for dressing like one of the Village People in private, it's prudent to develop a public persona that doesn't fit the profile. Be aware of your surroundings at all times, and look like you know where you're going ”even if you don't! Muggers typically look for people with lost looks on their faces.
An American flag T-shirt is fine to wear to a Fourth of July picnic, but that same T-shirt could backfire if you wear it to a Bastille Day parade in France! In other words, dress for the occasion.