Feathers are big this year and this open-back long prom dress is flush with free-flowing feathers. An extravagant choice for prom, military balls, and other formal events, this beautiful curve-hugging tight evening gown has fabulous feathered trim at the straight neckline, while thin shoulder straps criss cross the open back. Offered in misses and some plus sizes, this long formal dress has booty-contouring ruching at the back and sides of the skirt that smooths over the hips before ending in a small train. Surprisingly affordable, this open-back long prom dress, under $200, is ready to wow the crowd without breaking the bank.