Cafepress have just released a video telling you not to wear your political t-shirts and flair to the polling booths. They are trying to make your that your vote gets counted as in some parts of the county wearing your flair may be considered electioneering and you will get turned away. I am not American but I urge you to vote if you are.
I never expected to hear Cafepress tell you not to wear their products but it makes sense and even makes you smile. “Choose something safe to wear, like a button-down or a nice tuxedo.” Perhaps they mean something like this tuxedo t-shirt from Vintage Cotton.