Replicate it in the period in which the cloth appears to be from (Middle Ages) from the original Carbon dating (which now seems to be in question as well). That is the part of the equation you are missing.
They didn't have Photoshop in the Middle Ages...
Spot on, this is apoint many people are seeming to forget even if we give benefit of the doubt and say this is 200 yearls old. How could the photonic and electromagnetic effect have been faked in those times?