Making an elastic button closure can be really easy!
If adding the button closure to the back of a dress, you should have two pieces of fabric.....a left and right side. (or, in my case two scraps)
On the left side, working on the right side of the fabric....wow that's sound confusing doesn't it?!? Add a piece of cording that was cut 2 inches in length and then folded into a loop. have the edges of the cording towards the edge of the dress.
stitch into place. I zig-zaged over mine. Repeat as many times as you need buttons.
Then fold fabric over, about 1/2 inch. Iron.
Stitch from the front to secure and finish.
Walla, an easy closure to your dress.