1. Prepare a plush cloth, then cut a cloth as square.
2. Fold square fabric.
3. Cut it into two isosceles right triangles.
4. Fold it as shown in the photo.
5. Fold it as shown in the photo.
6. Sew up the side with more layers by needle and thread.
7. Use hot melt glue gun to stick the clip on the side stitched.