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I found an ingenious hoop skirt tutorial at OneWalking. No need for expensive boning from the fabric store. This hoop skirt uses water tubing from the hardware store. Awesome idea.
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Also found this awesome tutorial for a cage hoop skirt at TheDreamstress.com. I'm not sure what pattern I'm planning to use for our upcoming event, but either of these will do nicely.
After looking a little longer at patterns I ran across a step by step flash tutorial by Yiji at DeviantArt.com . Her tutorial is possibly the best, but since it is flash you can only view one page at a time.