Anyone who is working in a booth or kiosk is a representative of that business. All representatives of any business should be recognizable on sight, and one way to guarantee this is to make sure all of a business’ workers are wearing identical shirts.
Nice shirts. Not plain t-shirts that tend to look raggedy around the collar after a few hours. Invest in employee shirts that will represent your business right: branded golf shirts are always a good choice.
Few things are as annoying as wanting help or information and not knowing who is actually WORKING. The shirts will remove all doubt.