Black sweetheart neckline dress with sash

I bought this dress as a bridesmaid. It is a lovely dress comes with a sash. EUC as only worn once and then I had it dry cleaned. Black lace and beautiful decorative buttons at the back. Zipper closure. Bought this at the bridal store the bride choose so the brand is Mari Lee by Madeleine Gardner. The tag reads US 10 but I am mostly a size 4-6 in dresses so . Here are the measurements since this sizing is tricky. Pit to pit 44 cm. Waist 35 cm. Length 80 cm. Let me know if you have questions