The only special components you need for this project are some hook-and-eye closures.
A hook-and-eye closure is a very simple method of fastening garments together. It consists of a metal hook, commonly made of wire bent to the required shape, and an eye (or "eyelet") of the same material into which the hook fits. If you still do not know how it looks like go and check the picture in step 2.
Hook-and-eye closures can be found in magazines selling sewing supplies. In addition you will need some elastic and a two-component adhesive.
I recommend you to check your girlfriend's, wife's or mother's sewing toolbox first for hook-and-eye closure, elastic, needle and thread (smile).
The entire list is the following: