So, I made this floral skirt out of an old bed sheet. All I did was use the top of the sheet as the top of the skirt, because it was already conveniently double layered. Then I took a knee-length portion of the skirt and pinned it around the top until I was satisfied and sewed it on. I added a zipper for comfort, and thats it!!
I wanted a invisible zipper but didn't have one on hand, so I put a regular zipper on backwards. It works perfectly!