For Fall 2013, Phillip Lim managed to make sweatshirts infinitely cooler by adding a side zipper and rendering the classic in different fabrics from leather to lustrous double-knits to French terry. I am, in a word, obsessed. Designers like Rebecca Taylor and Theory (love!) are also coming out with compelling derivations of this silhouette. I have a very strong hunch this is something we will all want to put in our weekly rotation, come autumn.