Fashion's got a penchant for moving in a nostalgic cycle, reinventing trends from decades past, making them new again, then wearing them out, only to hail a comeback 20 years down the line. That said, allow us to introduce you to a new hobby worth trying: tracing this season's most coveted looks all the way to where they came from! Who threw a silk slip over a white t-shirt first? Aren't metallic, power-shouldered jackets a thing of the '80s? And what about that suede button-front skirt you love—it's a '70s relic, right? Below, 12 fashion Instagram accounts to make you yell "throwback!"