T-Shirt Stall
Guests that have bought a T-Shirt will wear it, thus changing their shirt color to the one of the stall they bought it from. The color can be customized. It is called Shirt Stall in RCT3, however, people do not wear them.
The Stripey T-Shirt Stall in RollerCoaster Tycoon 3 is similar to this stall, however it only sells a fixed color of striped t-shirts.