I gave another try to the TS66 IJN gray. Same overal feeling: that stuff looks way too dark compared to the prop pictures but it is really reactive to light conditions (as said earlier in the thread). Pretty fascinating how it looks different on pictures.
Here is a scratch made attempt to recreate a "stuntish" version
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That looks great!
Remember, the production props were really a dark gray—very close to the color of the blue gray uniforms worn by the cast (look at the color of the Tricorder compared to Kirk’s gray pants).