abstract
| - From the mid 2260s to the early 2270s, Starfleet uniforms were drastically modified from their earlier versions. The general tailoring of the "tunic and pants" uniform design worn by Starfleet service people was maintained, but with the addition of an updated collar, new rank insignia, and revised colors for Starfleet divisions and departments. (TOS: "The Corbomite Maneuver" ) These uniforms were made of xenylon, an algae-based fabric with a special appearance not often seen in the clothing before this period. The difference in fabric appearance was considerable, as Captain James Kirk once pointed out to an illusory inhabitant of the Melkot simulation of Tombstone, Arizona. (TOS: "Spectre of the Gun" ; TAS: "The Terratin Incident") Xenylon resulted in the crew of the USS Enterprise being turned into dehydrated porous cuboctahedron solids during an encounter with the Kelvans. (TOS: "By Any Other Name" ) In addition, they had built-in temperature controls to accommodate for cold weather environments. (TOS: "Spock's Brain" ) This style of uniform was initially put into general use by 2265, but some starship crews or individual service members continued to wear the older style until 2268. These uniforms were drastically replaced in the 2270s, with a change of many uniform variants sometime after 2270. (TOS: "Charlie X" , "Dagger of the Mind" , "Friday's Child" , "The Trouble with Tribbles" ; TAS: "The Counter-Clock Incident"; Star Trek: The Motion Picture)
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