Admittedly a slightly unsual situation but when working at a large amphitheatre the shirts were matching polos but the colors indicated the role; stage and
FOH crew as determined by the artist (usually black), security in white, ushers in yellow, parking in orange and maintenance staff in red (the
theatre's color scheme was yellow, orange and red). So it was very typical to see staff in black, yellow, white and red shirts in the
house at any time.