Deviation label setting

[[Ky...]]

Hi 

I am researching glove fit using the distance of the glove exterior and interior. Using deviation label, I am able to get the gap between the exterior and interior of the glove. However, it calculates the difference from the external glove surface to the internal glove surface. Is there a way to calculate it starting from the internal surface of the external glove (excluding the thickness of the outer fabric) to the interior glove surface? I attached some picture for easier understanding.