A slip stitch is an easy way to sew a seam from the outside of a garment or item (like pillows or stuffed animals).
This stitch is usually used for hems when the seam should stay unseen.
Step 1: Prepare your Thread
I prefer to use the double thread technique. It makes the seam stronger, especially in the case of pillows or heavy fabrics.
1) Thread your needle. pull the thread through as much as you think you'll need for the length of the seam. A good rule of thumb is double the length, you will have a lot of extra, but that's better than coming up short.
2) Double the thread over at the needle. Cut.
3) Make a knot to secure the two ends.