The description sounds more like a material that reflects the light from the back surface of fibers, rather than the front surfaces.
Tachi's second example shows the image of the skeleton being projected onto a sheet of the retroreflective material, giving the impression the body has become transparent.
This seems fairly clear it is a technology as I described. What you describe would likely have to be a near-solid mass, and inflexible (else it would conduct to the wrong place and angle).