Guest: Is the exterior clothing important?

Prabhupada: Yes, important. Just like officially the policeman must dress, but a policeman sometimes in ordinary cloth also, that's his duty. But that is special case. But external, external dress is also required. In the dress of a police if he is a thief, that is very dangerous. That is very dangerous. Just like this dress of sannyasi, saffron cloth, one will respect that "Here is a sannyasi." But if he is a thief in a dress of a sannyasi, that is dangerous.

From: My Glorious Master, by Bhurijana Prabhu.