This is likely a Tsukuba University soccer uniform from almost 30 years ago. It's not a stain, but as you can see in the photos, there are areas where the thread is embroidered thickly on both the front and back. I think it's in relatively good condition, but it is a used item, so please only purchase if you understand this. #UniversitySoccer #TsukubaUniversity #SoccerUniform #SoccerShirt