Satin bodycon dress

Bodycon satin dress, flattering fit, in like new condition. Black dress, very dark blue waist band. Shown as 6 US, but runs very small- mannequin is regular S size with 36” bust and I was not able to zip it all the way up (it is not very stretchy at the bust area due to the band). Has flexible shoulder straps so length measured from top bust line to bottom appr. 35”, lying flat armpit to armpit appr 16”, waist 14.5”, hips 18” . 35% cotton, 60% polyester.