Crinoline is a stiff, coarse type of fabric that can make some clothes rigid. If you want an extra puffy skirt, put a layer of crinoline under it.
You ever notice how a hat is stiffer than other clothes? The material that often makes it stiff is called crinoline. Crinoline also used to be popular as material in woman's skirts, the kind of skirts that were two or three times wider than the woman: crinoline helped achieve that effect. Crinoline was originally made with horsehair, but now material with the same purpose is still called crinoline, though it might have a different composition.