Lace-Up Long Prom Dress: Jessica Angel 366Slip into refined style in this long prom dress 366 by Jessica Angel. A classic choice for prom, galas, and other formal events, this long designer dress has a princess cut bodice with thin shoulder straps that criss cross the open back. In misses and some plus sizes, this long formal dress smooths over the hips before opening in a side slit. A small train completes the look of this open back long prom dress that is as flattering as it is glamorous.