It is brand new and has never been worn except for when I tried it on.
It is a size 6/8.
This is the description directly from the Maggie Sottero website:
One-piece, strapless, slim A-line gown with sweetheart neckline and corset closure. This chic, Demir Stretch Satin silhouette features a ruched bodice and gentle gathering at the side skirt. Understated beaded embellishments with Swarovski crystals adorn the neckline and hip.