all it takes is a long skirt, a needle, and some thread.for this little bubble.
long enough to be halved in length
an elastic waistband to sew into
a light fabric that will work well doubled in thickness (the one i used was totally see-through un-bubbled)
basically, i just sewed the bottom hem of the skirt into the inside of the elastic waistband. i pinned it first to make sure it was even and left some slack in the thread to make sure the stitching would not pull out when the elastic stretched.