Here's a long sweetheart one-shoulder prom dress that shows off the curves while offering a look of drama. So seductive for formals, prom, and other black-tie events, this tight long evening gown has a one-shoulder bodice with a sweetheart neckline, while ruching at the waist camouflages the tummy. The elegant one-shoulder long formal dress has a hip-hugging long skirt with a side drape that flows to the floor with the sensational look of a train that flows behind every step. Surprisingly affordable, at under $150, this classy one-shoulder long sweetheart prom dress is as budget-friendly as it is timeless.