CB2001 said:
Think acrylic clear plastic would be a good idea. I know Hobby Lobby has some in multiple sizes (as thin as a CD and flexible) that is useful as replacements for a picture frame. I have a piece I picked up with the intention to do a EOLC Sector disc. Also, I don't know if its available, but mirrored window tinting (for automobiles) should also be useful to get the reflectiveness to where you can't see the eyes, but still be able to see out.
Now, I know you designed it to wear on the face, but if I recall the movie, one scene had Batou wearing a pair of glasses frames over them to look like they were a pair of sunglasses. I could be wrong on it and may have to rewatch the movie to be sure.