Method 1 (crinoline): Get tulle. Lots of tulle. Make an A-line skirt that tapers into your waist (waist measurement about 1.25 times your waist, gathered into a sturdy waistband) but is very full around the hem.
Then make at least two more. Wear them one on top of the other underneath your outerwear skirt. Method 2 (hoop skirt): Get an old flat bedsheet from the thrift store (as ugly as you like if it's not going to show), lots & lots of bias tape, and either plastic "boning" from the fabric store or 3/4" lumber strapping for stiffening.
Sketch out an A-line skirt to scale (1 inch:1 foot is works well) using your waist measurement & the taper you want. You'll need a hoop of lumber strapping about every 12" down the length of the skirt, boning should be every 6-8." You'll have to do some math here: the length of each hoop will be 3.14 times the diameter of the hoop (remembering to multiply by 2 if your sketch shows just the front half of the skirt and you've used just half your waist ... more.
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