Designation of workers by collar color

Designation of workers by collar color is a way to quickly identify what kind of job each worker is doing. Usually it is used in factories or warehouses and the color of the collar on their uniform will tell other workers what that person is doing. For example, red collars might mean that the worker is in charge, while blue collars usually indicate that the person is a regular worker. This makes it easier to know who is responsible for what job and to give orders quickly.