The reason the last deals Uniforms, as well as symbols of the occupation. To provide uniforms to make people see that we can know what occupation. By know from looking at the machine.
A final reason Uniform is a symbol of occupation The clothes can make people know that we are exposed to an occupation. The knowledge gained from looking uniform.
The last reason, the uniform is a symbol of the profession. To wear the uniform can make people who see know we what career. By know from seeing the uniform.