There's a common misconception about that. The color confusion of the Kirk-Sulu tunic was not caused by the NTSC television format, nor by the film stock they were shooting on. It was the dye itself. Theiss bought white fabric and dyed it, and the pale shade of "green" he chose for Command looked green under ordinary lights, but under bright studio lights or sunlight, the same pigment looked yellow-gold. And this was to the naked eye, in person. The show's 35mm film and the orginal television broadcasts were accurate.
Theiss himself did not work on set with those bright lights, so he thought the uniforms were green. He used a darker shade of green on the wraparound tunic, which was originally intended to ensure that one Kirk in "The Enemy Within" would be easy to distinguish from the other.
When Star Trek was re-mastered for the 2006 DVDs, they falsely "corrected" the image by deliberately biasing the uniforms back toward green. That was a mistake. The shirts really were gold when seen in bright light.
[This is a re-post of my reply to the same issue in a prior thread.]