Looks like some sort of demon armor. It may be something he made or help make and that’s why he adorns it. I’ve made armor pieces in the past, mine always seem to be the more “darker” pieces as well. In history armor was also a form of intimidation or a fear presence. Except for that inverted cross and satanic imagery. Symbols are a very powerful statement on armor. Would like hear Elon explain those. Esp since he doesn’t believe in Jesus, or didn’t used to. Would be interesting.