I think the problem is that most women's skirts (and what other can you buy?) these days are tight around the hips, and, if they flare at all, do so at mid-thigh or even at the knees. This seems to emphasize my "spare tire", not to mention giving me a feeling of being restricted in my movements. I recently bought a beautiful skirt on-line, but returned it because even though it was 3X, it clung too closely to the area below my waist. I've noticed that the models in the catalogs I buy all seem to have flat tummies, and the skirts all look good on them. (But then, anything would look good on them!)
I also have a couple of those "Indian" skirts -- made of gauzy cotton, usually tiered, and fairly full, and they also make me look fat: they drop straight from the waistband to the floor, which makes me look like a fire hydrant.
I've noticed that the skirts I like are all at least somewhat flared, but are also gathered at the waist. The ones I've been making lately are usually around 55-60" at the top, gathered to my 46" waist, and have a lining. This makes the skirt stick out some right at the waist and makes it roomy around the "booty" (to use the Utilikilt technical term

I wonder if there are any general principles at work here?