Sweep Train Zip Sweetheart Elastic Satin A-line Prom Dress. The sweep train prom dress has a slight flair with delicate ruching design on the bodice. Zip-up closure highlights the prettiest part of your back and creates the distinctive design with an empire waist. Fit for prom and military ball. Buy this Dress and you can Save 80% OFF on Sweep Train Zip Sweetheart Elastic Satin A-line Prom Dress@FancyLadies.