Do black tee shirts have special significance?
Looking as non-descript as possible will help avoid identification. All black, with no logos, colors, jewelery, or any other identifying markings or accessories would make someone hard to positively ID, either during a chase or in a lineup. I’d read an article a while back about “the uniform” – baggy blue jeans, white T-Shirt, nothing else identifying. When someone commits a crime wearing “the uniform,” all they need to do is flee through a crowd of similarly dressed people to lose any pursuit. I’ve found this article online that also mentions it, and variations.