This is not Steampunk Pinhead. This is not the formal tux of Ron Maiden, lead singer of Iron Maiden. This is a Russian Bear-Hunting Suit. Or at least that's what it says whenever this picture pops up: "Russian Bear-Hunting Armor," "Siberian Bear-Hunting Suit," "18th Century Bear Armor." Whatever, it's generally agreed that this is insane and Eastern European, and has something to do with bears. Which, to be fair, is true of pretty much all of Russian history. Dig a little deeper into the comments, though, and you'll usually find some controversy: This isn't real, they say. It's actually part of an exhibit in the Menil Collection called Wunderkammer.
Wunderkammer is a surrealist "room of wonders" where objects that have inspired various surrealist artists are displayed. Buzzkill Internet assholes (like myself) love to point out that this suit is just an art piece and not likely to have been used to wade through an ocean of furious, impotent ursine opponents. However, those buzzkilling bastards are missing some vital information: The plaque beneath this suit reads "'Wildman' costume, 18th or 19th century, Germany or Switzerland. Two-piece leather hunting suit with wood spikes and iron chain." See, Subsonic the Hedgehog up there is not a surrealist art piece at all -- it's just a piece that inspired a surrealist artist. This bear suit was, at some point, earnestly built for use by hunters. So back in the 18th century, a bunch of Swiss got together and pondered the question of what could be done about the gargantuan slavering predators that kept hugging them to death.