This is one of the most brilliant things I have ever seen! Try to make one that isn't Religious in any way, and have it say something that no one really pays attention to.

Like, a shirt that says Rice and Bean in big flashy words. (Something really...different) that forces people to imagine things completely other than what they normally think.

People will will be so confused and intrigued, that it will spark their interest in where they can get one, and you can start an entire line of really random clothing designs that go against the norms. (Vat 19)

It's kinda what Chanel did up up until the perfume part by wearing modified men's clothing.

Just make something really bizzare that stands out and sport it in public and people will assign their own interpretations to its bizzarness and feel unique having one for themselves.