Sienna Miller, Cara Delevingne Kate MossKarl Lagerfeld Marc Jacobs

At the start of a new year, there's always plenty to look back at: pop culture moments that made us all laugh, political milestones that made us all cry; music, technology, social media, and Breaking Bad. But some of our favorite things to reflect upon are the major moments that redefined fashion. Throughout 2013, the industry underwent plenty of changes that made headlines, from designer switchups to diversity on the runways, but it wasn't all serious. Style evolved thanks to one infamous Twerker, supermodels switched up their cover shoots, and two words: Paris, Texas.