This gorgeous long lace prom dress is from the La Femme Curve plus-size collection. The sophisticated evening gown has an alluring off-the-shoulder neckline and long sheer lace sleeves. The plus-size formal gown is fully lined and flows softly over the curves before pooling into a trail-behind train. Here for prom, this plus-size long lace prom dress is the definition of perfection for other formal dances as well.