Wearing orange vests started with highway work. First it was recommended and then mandated in contracts. It was a good thing, since it does make moving targets more visible; especially at night. (Yeah, I know that sounds cynical, but after hearing a driver tell a trooper he didn't see a crash truck with a bazillion flashing beacons, I don't see the real benefit.) This has expanded to other types of working folks, including workers at retail outlets.
Anyway, I've noticed convenience store workers wearing vests, so I asked a worker about the new apparel. They, too, are mandated to wear the vests, while working outside the store. So now, like me, they can be asked where the PVC glue is found, if they're wearing the vest, while shopping at Lowe's.
You might want to buy one just for kicks. The look on people's faces is priceless, when you tell them PVC glue purchases require a contractor's license, or they stopped selling 2 x 4's..