Ok I am not sure what to call this one- I will call it tornado back.I did this shirt for my cousin using another shirt she had bought at Target as the template. That is the aqua-colored one. I figured it out pretty quickly, but practiced a few times on an ugly shirt to make sure. I have provided a step by step tutorial for you. Start with a plain shirt, and fold it in half on the back. Make sure the front is out of the way so you don't cut it. There will be 12 total ovals to cut. Each oval will be 3/8 inches wide and the ovals will be spaced 5/8 inches apart each. Starting with the length of the top oval, these are the lengths going down on the shirt: 9, 8, 7, 6, 5.5, 4, 3.5, 2.75, 2, 2, 1, .5 inches. So while the shirt is folded in half, measure these lengths and widths using dots with a pen. The lengths of the ovals will be in half for the numbers I just wrote because those are the lengths while the shirt is open. (For example, the first cut you make will be 4.5 long.) When those are cut, open the shirt and pull the pieces between the ovals to make them stretch. Weave them starting at the top and pulling the string below through the hole above it. The bottom gets a little tight , but when you get there, sew that bottom loop to the shirt to fasten everything. Then adjust the shirt by pulling each loop, starting at the bottom loop.