Isn't it the other way around? Bus and streetcar operators should have the T symbol on the jacket right shoulder, to be in view of the passengers as they board? Or is is the (U.S.) flag on the right shoulder facing the public (and the T on the other shoulder)?
The fluorescent green (looks yellow to me) / orange vests for operators must be something recent. I only recalled outdoor employees such as track workers wearing them.
I have made Halloween costumes (such as Superman), with patches and emblems made from cloth scraps or cardboard, and stuck on with double sided tape or safety pins.
I would say that you should not wear a T uniform or reasonable facsimile as a costume while riding the T.
It took me a long time to acquire a Honolulu transit uniform. They only require and have manufactured the shirt, an "aloha shirt" with their "The Bus" logo all over it. They do not sell it to the public. I would never wear it while in Honolulu although it would be okay for riding the T or visiting a trolley museum.
Adult and teen guests in Disney parks may not wear costumes that represent Disney characters, or outfits that are facsimiles of employee uniforms.
The quality of the ride is more dependent on the travel path as opposed to the kind of vehicle or the kind of energy propelling it.