For around 15 bucks (using sale codes), you can get the words put on a t-shirt.
https://www.zazzle.com/create_your_own_mens_dark_short_sleeve_t_shirt-235698764003581264
They also have sweatshirts, ladies cut T shirts, hoodies, etc.
Personally, I think it is probably best to put the words on the back. That way, people can read them without you knowing. They might feel less intimidated to do so if they don’t have to look at you head-on.