Tunic from the very first episodes, with small zipper on left shoulder, modified later with black collar.

Worn, at least, by John Arndt, as crewman Fields, in Dagger of the Mind.

Study by Gerald Gurian

Star Trek TOS 1st Season Command Tunic

Below are some detailed photos of a screen used Command tunic from the 1st season of Star Trek: The Original Series. This costume was constructed from a gold velour fabric which had a tendency to shrink, sometimes considerably, during cleaning - and this behavior eventually prompted the wardrobe department to switch to a more stable nylon diamond weave double knit fabric for the creation of the 3rd season Starfleet tunics and dresses. In the last photo a bolt of Phase II square weave command fabric, which perfectly matches the lime green color of TOS 3rd season command fabric, is shown side-by-side with the gold velour, for color comparison purposes.