Jersey Shore - The Shirt Before The Shirt T-Shirt. Jersey Shore has introduced us to an entirely new concept. Though this concept has been practiced by Guidos and club heads for decades, it never had a name... Until Now! The shirt before the shirt! You know when your lounging around before a night out.... You are fresh-out-the-shower but not ready to get dressed yet so you kick it low-key in your sweats and a tank. The tank is the shirt before the shirt! When you thrown on your jeans and your club shirt you are ready to go.. But before then it's "the shirt" (before the SHIRT!).