Floor length chiffon gown

Floor length chiffon gown in dusty purple- gown has some shimmer. Purchased in a size 6, but fits like a size 4 (I am usually size 4 dress, size 27 jeans, 5’9). No alterations except padded cups added, and scalloped belt stitched on. Fabric has a snag on bottom front and some water stains on bottom hem, but not visible when worn, especially if hem is shortened. Was a bridesmaid dress, but would be great for prom. Purchased for $230, belt was $80, but priced because of damage.