In a sign of how narrowly-focused fashion has become, this company sells T-shirts (like this branded one that a racecar mechanic might wear) printed to look like it’s dirty with motor oil:
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I’m not sure what this is supposed to be, below the neck: A tribal tattoo sweat stain?
One weird thing is what they list the color as:
In any case, if these are for you, they’re currently 19% off.
Source: core77