Love that, it just needs to be weathered.
There is, even now, Polarizing and De-polarizing visors/sunglasses sold, They look like just normal eyeglasses in normal light, but when in direct sunlight or otherwise just bright light, they automatically polarize, but It takes some time to polarize/De-polarize, time counted in few minutes.
Likin' your padding too, though it looks a bit too bright for me. would look better if it was made out of dark grey or black
JustMe