Star Trek uniforms are costumes worn by actors portraying personnel of a fictitious Starfleet in various television series and films in the Star Trek science fiction franchise. The costume design often changed in the various series, to represent different time periods, and for reasons of appearance and comfort. Sometimes different styles were deliberately mixed to enhance the sense of time travel or alternative universes. Original series The original uniform designs were the product of costume designer Bill Theiss. These uniforms consisted of a colored top and dark pants, with significant variations between the designs used in the pilot episodes and the rest of the series. Pilot version The Starfleet uniforms seen in the unaired pilot "The Cage" (footage of which was re-used in a later episode, "The Menagerie") and the second pilot "Where No Man Has Gone Before", consisted of a tunic with a heavy ribbed turtle neck collar for men, and a cowl neck variation for women, each in three colors: gold, beige ("sand"), and light blue, worn over charcoal slacks. Gray jackets were sometimes worn on landing party duty. Officers in the first Star Trek pilot, "The Cage", wore a single solid gold sleeve stripe, and only the officer grades of "lieutenant" and "captain" were used in dialog. A "chief" was also visible, but wearing a different sleeve stripe, consisting of two thin lines encircling the cuff, with a wavy gold line appearing above and below these lines. Characters addressed as "crewman" wore no sleeve insignia. The gray coats also bore silver rank stripes on the sleeves. In the second pilot episode, "Where No Man Has Gone Before", most officers again wore a single stripe; Captain James T. Kirk wore two stripes. The rank indicators used in the pilots and the production series differed because Roddenberry and Theiss had not yet worked out a consistent system for officer-grade indicators on the uniforms; this they would do after the second pilot. The original series Starfleet uniforms do not include headgear of any sort, including the officer's combination cap and service side cap. Production version The original uniform material was velour. This was used in the first and second seasons because it was cheap and easy to care for, but it shrank after it was dry-cleaned, and it tore easily. It was replaced in the third season by a nylon fabric used in professional baseball uniforms. Differently colored shirts were