Reminds me of the "hack" that was done to the Samaritan system in the excellent TV series "Person of Interest." Granted, you have to suspend disbelief on many points of AI to enjoy that show but I never understood why they couldn't work around the bug that was placed in the system that prevented the identification of seven people. In the examples cited, like tricking the AI into thinking that a turtle was a gun, there's an easy fix once the misclassification is noticed. I suspect the "t-shirt of invisibility" will similarly be accounted for in the system and that people seen wearing it will be targeted for MORE scrutiny as it could be presumed they are trying to hide in plain sight and that there might be a nefarious reason for it.