If you've ever marred your favorite shirt with blood, grass, red wine, and/or bike oil, Dirt Pattern Material might be right up your alley. It's a shirt with a special pattern, a "camouflage" of the aforementioned stainers.
This pattern doesn’t hide the wearer — it camouflages their past. The disruptive coloration allows for new stains to be incorporated, continuing the design process and evolving the pattern over time.
It looks to be a one-up concept by MairWennel, so you'll have to figure out how to make one on your own. I'd start with a glass of red wine.