a large crochet hook (between 5 and 8mm)
1.Take your t-shirts and cut off the bottom edge and cut across under the arms so you have two tubes.
2. Cut out the side seams so you have 4 rectangles of roughly the same size.
3. put all the pieces together lining up the short edges and cuts about 2cm deep and 3cm apart (this does not need to be accurate) on both sides, make sure you have the same number of cuts on both sides