Open-Back Long Formal Prom Dress by Dave & JohnnySo sophisticated, this open back long formal prom dress is simply elegant. From Dave & Johnny, this long designer dress defines femininity from the scoop neckline to the floor. With a sexy open back, this princess cut evening gown gets a fitted look with criss crossing bands that lace up before tying into a fully adjustable bow. Hip skimming and sultry, this long formal dress flows to the floor before pooling into a dramatic train that follows behind.