I believe it would go in the head slot. There are already glasses in the game, such as the scientist glasses and those cateye glasses, but none such as awesome as rimless shades fit for piloting a mech.
You would think these would be the first thing being implemented into the game, since glasses are really easy to make, of course we already have scientist glasses though, but...
I need a bubble around my character because his name is Brobubble (it was randomly generated, I kid you not).
Love the idea! Scientist glasses doesn't look much badass, but some sunglasses would. I'd imagine driving my spaceship with sunglasses on.