It's not about looking skinnier, it is about looking longer and smoother. Many plus-size women are happy with their curves and do not strive to dress “thinner.” They simply want clothing that will flatter what they have. By creating an elongated silhouette, you look smoother and sleeker.
Pieces that help you to achieve this look include v-neck tops, high heels and outfits with a monochromatic theme. Avoid clothing that is too tight --- this will not flatter your curves at all.