Pick a nice selection of buttons that work well together. Either choose completely 2 hole buttons or 4 hole buttons.
Cut two lengths of elastic if you are using 4 holes buttons or one if you are using 2 hole buttons.
Thread the elastic through the holes on a button.
Continue with the remaining buttons.
Tie the ends of the elastic together in to a knot.
Trim off the excess elastic and it's ready to wear.