Here's a long plus-size prom dress that is chic yet refined. From the La Femme Curve plus-size collection, this lovely long formal dress has a ruched surplice v-neck bodice with bra-friendly shoulder straps that lead to the v-back. The sleeveless evening gown has a figure-flattering long skirt that showcases the curves with side ruching and a sultry slit. In plus-sizes, this long designer prom dress will forever be a classic choice.