I did something similar to jessio's tutorial, only I was lazy and used a half-slip as my base. Then I got six yards of tulle, folded it over until it was six yards of tulle that was six inches tall, and gathered that and sewed it. Repeat for another layer (I sewed this one on upside-down about two inches above the other one for a good solid poof) and finish with a circle of lighter tulle to keep it all in place. So...really it's not a whole lot like the tutorial. :S
when I wear my petticoat, I wear another half-slip underneath to cut down on the scratchiness.
I wish I had a good picture of this petticoat in action (it really puffs out nicely) but I don't... =<
"It's the ladylike way to kidnap."