A really weird petticoat question...

Ladies and gentlemen, I have a really weird question for you all. I am just going to say it now: I want to talk about what the underside of your skirt looks like. This is weird enough that I'm pretty sure I didn't find it in the memories...

A lot of pettis seem to have that amazing full-coverage poof underneath the skirt; that wall of ruffle coverage that looks like it should just be a doughnut shaped wall of fluffy. It's hard to explain, but they look like there should be no way to see anything but the petticoat's bottom and where your legs disappear into it. A)For anyone who has a petti like this, does it really look like that from underneath? B)Which types of pettis (organza, tulle, organdy, etc) and what brands work well for this?

All I've got goin' on is a Bodyline petti and a tulle one that I've made, and I definitely don't have all that awesome going on under my skirt XD A lot of sweet-Lolis get a great deal of poof from their pettis, but I never can tell what types they use and whether or not there is a solid layer of poof underneath. I hope that this isn't so weird that no one can answer it.

Thank you to anyone who can figure out my insanity XD