The ladder stitch is a very useful stitch in puppet building. It will allow you to stitch an opening closed from the right side of the fabric with a virtually invisible seam. Learn the ladder stitch and keep it in your bag of tricks. You will find it comes in very handy.
First, insert the threaded needle through the wrong side of the fabric near the start of the opening, pulling the thread through so that it comes out of the right side of the fabric and allowing the knot to catch. Now you are ready to start the stitch.