For those ladies who are larger around the hips (what I like to call perfectly proportioned posteriors :) long and swirling dresses tend to be the norm. But you don't have to follow established practice. Curvy hips are an asset - part of being feminine. One issue to look out for is the hemline, particularly if the dress is all one colour. The hemline breaks up your height, and also the length of your legs. A very short dress breaks up your height close to half way up, and thus might make you look shorter, unless your legs are very long. A hemline at knee level, breaks up your leg length half way, and might make them look shorter. The shape of your legs influences the hemline decision, but oddly enough, this is less so with larger ladies than with slim women. That is because on a slim woman, the skirt may almost touch the knees, but a much large lady has knees recessed into the shadows of the skirt. And because people see your legs from above (unless they are lying down!), a higher hemline will still hide more leg. The decision comes down more to the silhouette the skirt forms around your hips and down to the hem.
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"KIYONNA"
Some smart casual dresses, for day-wear or special events, from "Kiyonna":
* Kiyonna.com up to 5X.