The Original Series uniforms are known for their colors of Command gold, sciences blue, and operations red. However, this in actuality was not true but later became canon. The command uniforms in trek were actually a shade of green originally, but due to the lighting on set and a few other factors, the command uniforms appeared as gold on television. This color palette stuck, and gold was later confirmed in-universe to be the TOS Command color in DS9’s “Trials and Tribble-ations”

This is where my question comes in. Upon realizing that the green uniforms (not counting Kirk’s alternate green tunic) appeared gold on screen, did they switch the actors’ costumes out for gold? I ask this because of this picture I took (apologies for the quality and blockage, this is a zoomed in photo):

This was taken at a museum in my state, when a Trek Memorabilia event had taken place for a few weeks in 2019 before heading to the next state. As you can see, this TOS uniform is gold, just as we are used to seeing it.

My only thoughts as to an explanation to this are as follows: either

A.) the costume colors were changed

B.) this is a costume from trials and tribble-ations (I can’t quite remember the label for this specific part of the exhibit but I’m quite sure it was for TOS only)

C.) could it be fake? (I don’t think so, but you never know) they may have used a filler uniform as an example.

D.) a possible color fade over the many years since the show originally aired

Does anyone know any information about this or have any thoughts?