Funny, but you just can't find anywhere that John teaches us to dress like the world so that the world will think we're cool and then want to accept Jesus. Or to model our christiaity after styles that are acceptable to the world.
I mean you can't find that anywhere. The closest you can get is Paul saying that he is "all things to all men"... but if you read the context he's talking about the issue of "the law".
That's like the old joke... right? The guy who grows up in a church. When he's 19 he moves off and lives a sorted life with all kinds of sorted people. A few years later he runs into his old preacher in the supermarket and the preacher asks him what he's doing. He replies... "oh the work of the Lord.....I'm developing a testimony".