Category III clothing
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https://www.redbubble.com/i/t-shirt/Category-III-by-SynthSkin/15423359.IJ6L0
If you want to put the Category III on your clothing you can have a few options at Redbubble:
Redbubble:
Teepublic:
Transparency: I am neither of the sellers but I have just bought the smaller black one and will be wearing it to see Enter The Dragon later.