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Shirts are too easy to fake

Not necessarily, could use a higher end fabric to make such significantly more expensive.

e.g. http://www.sunspel.com/uk/mens-sea-island-crew-neck-t-shirt-...

How would someone be able to verify that walking past you on the street?

Install a GPS tracker in the shirt and put a huge QR code in the back allowing you to verify the shirts current location on the official website.

smart thinking!

Hi, you can also use a bubble code http://www.prooftag.net/ which can't be reproduced added with the QR Code in the back ;)

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