A few years ago, at least, a lot of skirts were designed to ride low on the hips, weren't they? But I don't think they were called "low rise," simply because the concept of "rise" doesn't exist for a skirt. Where the skirt hangs depends on how the waist compares to the hips. If the skirt's waist is 10" smaller than the hips, it's supposed to hang at your waist. But it the skirt's waist is only a few inches smaller than the hips, it was designed to ride much lower, obviously.
Sometimes you can tell that from a picture, particularly if the skirt is being modeled.
At the risk of suggesting the obvious, have you considered getting a waist cincher and/or a panty girdle with hip and butt pads? You shouldn't need much. After all, most clothing is cut for a 10" difference between waist and hips. You already have a 6" difference, so if you knock 2" off your waist and add 2" to your hips, you're there.