Thread chains can be quite handy. You can use them to keep two layers of fabric together but loosely to allow for movement (such as a main fabric and a lining).
Threads: Thread Chain: Susan Khalje demonstrates this couture technique.
Thread Button Loop Tutorial or Thread Chain
Sewing thread is depended on to hold your garments and projects together. Find out the most you can about sewing thread so that you are an educated consumer and happy with your sewing projects!
Video: How to Sew a Thread Chain - Threads
How to make a thread chain tut.
A thread chain has lots of uses. It can be a delicate button loop, it can take the place of the metal loop in a hook-and-eye closure, it can be used as a French tack to attach a lining to a garment…