DIY; Ripped Back Tee Shirt, Polyvore What you need; plain oversized t-shirt+scissors+design. How to; (based off the picture) 1. Get your scissors and start from the back of the sew line of the sleeve. Get the scissors and cut long strips to the middle. 2. Stop once you get to the middle. 3. Repeat all along the side, and the other side. 4. Cut a big chunk off, make a vneck , but veryyy big. This will make the diamond shape. 5. At the bottom, cut a very small vshape. done.