Below are some detailed photos of a screen-used velour command tunic from Star Trek: The Original Series that may have been worn by William Shatner as Captain Kirk prior to being redressed to the rank of Lieutenant. The closeup views of the cuffs clearly show the imprints from more elaborate braid which was previously affixed to the costume. The traces of multiple bands of decoration are indicative of the patterns seen on Captains and Commodores tunics. Photos of authentic TOS Commodore braid and insignia, worn by actor William Windom as Commodore Matt Decker in the 2nd season episode "The Doomsday Machine" (first airdate: Oct. 20, 1967) are shown following the tunic images.
Many thanks to long time Star Trek fan and collector Paul in France for his kind permission to display these photos.