Like your parents when you're not around, rock music has a thing for leather. Whether it's the substance's luster, its animal origins, or the fact that it's associated with bikers and dominatrices, metal and rock fans have always been really into leather jackets, pants, boots, gloves, and gauntlets. But it wasn't until punk and metal in the '70s and '80s merged '50s greaser culture, outlaw road warrior attitude, and S&M gear, that leather became the ultimate fashion accessory for the aggressive outsider.