Named Alances, this beautiful long ruffled a-line prom dress is a classy style that is surprisingly affordable. At under $200, this long designer dress from Velvi offers a flirty look with a plunging v-neckline and thin shoulder straps that criss cross the open back. In misses and some plus sizes, this elegant formal dress has a long a-line skirt that includes fluffy vertical ruffles from the banded waist to the floor. As beautiful as it is budget friendly, this long ruffled a-line prom dress is an upscale style that won't cost you a fortune.