Patent Leather
Go find a Matrix movie poster that has Trinity on it, for example:
this one. You\'ll notice that patent leather reflects exactly like metal would, except that there are only two colours: the colour of the leather, and the colour of the light source. There is little or no other highlight on the leather.
You will note in the reference picture that there are two light sources, and that Trinity\'s face is reflected on the shoulder of her outfit. If she were carrying a prop, it would probably reflect off the outfit as well. Patent leather behaves like a black mirror, which means that it reflects white the best, and other colours tend to be eaten by the leather (her face is light enough and close enough to show up, but far-off or dark objects wouldn\'t show).
However, in the reference, you will want to note that the contrast is bumped up a lot, and that IRL patent leather has some shade to it. But minis are also generally high contrast, so a black/white patent leather scheme might look good. On the other hand, it might not. I\'ve never tried it, and it will take some effort to get sharp white highlights on a black background, even if you\'re using pure artist-quality titanium white (which I recommend for something like this). It could be that patent leather would look like crap unless you add some shading, or are really ridiculously careful with your highlights. Good luck.