It's called the Marc Jacobs Effect, and as far as I know, it was invented by our own Cynthia Nellis, Guide to Women's Fashion.

Cynthia notes that most of our current trends - metallic prints, shorts, the 80s revival - trotted down Marc's runway a year before everyone else was doing them. He's the fashion equivalent of that cool kid in school who always knows the band that's just about to break.

If the Effect remains constant, we can expect to see some ruffles and unders-worn-as-overs at next year's shows. I'm not sure how I feel about showing the world my lingerie, but I'm pretty excited about all the flat shoes at his show this year. That's a trend I can get behind.

Photo credit: Marc Jacobs by Fernanda Calfat/Getty Images.