If you are letting go of the idea of curves, or want to camouflage your midsection, flowy woven fabrics, or knits with drape, are your best choice. If you want to enhance your curves, or create some, look for more structured, fitted knits.
As with any body shape, the waist of your dress needs to hit the waist of your body. Because of this some Rectangles look great in a fit-and flare style, while others who have no defined waist should look for shift or swing dresses. 59ce067264