For a pouffy version of the plain pleated skirt all you need is an old pleated skirt and a sewing machine. The idea is to sew rows of stiches across the pleats, like this:

Once putting the skirt back on now, it will be all pouffy and nice, like this:

The easiest trick in the world!

The pictures don’t do the skirt justice, cause it’s much more pouffy and hangs very nice over the hips. If you don’t get how it’s done, think of it as if you’re going to shorten the hem and fold it up, but only sew a mm or two in. You do the same thing with an inch or two in between each row.