PPL's wearing the Transair stuff is laughable, along the lines of alot of students who 'forget' to take their flying text books off the rear parcel shelf!
I would prefer it if they read them personally....
These same cars usually have bumper stickers saying things like "pilots do it inverted" and other such hilarious comments.
To be honest wear what you like for safety, but nobody likes a show-off.
I made the mistake once of going to a pub for lunch in my uniform with a couple of guy's from work and we were all mistaken for security guards!
But as others say, who cares........