The Starfleet uniform code was the group of Starfleet regulations governing the proper manner of wearing Starfleet uniforms. (Star Trek II: The Wrath of Khan) The uniform code of the 23rd century Federation Starfleet permitted some personalization of the uniform. Lieutenant Uhura and Dr. Ann Mulhall wore earrings. Scotty wore a kilt and sporran as part of his dress uniform in the 2260s. Native American personnel were permitted to wear traditional jewelry with their duty uniforms in the 2270s. (TOS: "The Savage Curtain" ; Star Trek: The Motion Picture)