Gorgeous gown

Beautiful gown. No brand and no size but I’m guessing it’s a 8. I know it was very expensive but since I don’t know the brand, that’s why I’m selling it for cheap. The top is black and white polkadot sequins. The bottom portion is black and white checkered. Zipper in the back. In excellent condition. The black fabric hanging down the dress is a piece of fabric you could tie anywhere or not use at all. It’s not attached to the dress.