The stew that is SI Swimsuit is made from a variety of ingredients - stunning women, magnificent locations and world-class photographers to name a few. Another crucial ingredient is the actual swimsuits. We raided the desk of editor MJ Day to find Polaroids of the models' initial swimsuit fitting and discovered a stash of Nina Agdal photos as she prepped for the 2012 and 2013 issue. Here's a look at Nina's fitting and some of her best photos from the issues.
MORE FROM THE VAULT: Leryn Franco's swimsuit fitting