PJ Pants, boxers & Bloomers
PJ Pants, Boxers & Bloomers all use nearly the same directions, so if you learn one you learn all three.
Push 1/8 inch whide elastic thru casing
Stitch or pin one end of the tunnel closed. Be sure the end of the elastic is stitched in place.
Work the elastic all the way to the other side until ¼ inch sticks out the other end of casing.