Cowl-Neck Long Satin Prom Dress: Morgan 10037NSleek and sassy, this strappy open back long satin prom dress 10037N by Morgan is as figure flattering as it is affordable. Priced under $150, this long evening gown is crafted in gleaming satin fabric from the cowl neckline to the hem for a luxurious look without the high price tag. The long satin formal dress has thin shoulder straps that criss cross the open back before tying into a bow for the best fit at prom, galas, and other black tie events.