this hasn’t quite made a huge splash in the US but it’s all the rage in
China.  What is it?  It’s a custom printed t-shirt that gives the
illusion to passing cops that drivers are wearing their seat belts.  Clever! 
Why risk being safe when you don’t have to?  Personally I think the most marketable thing
about this custom printed t-shirt is that you will have a tourniquet handy
after your fly through the windshield.