Cocoom back zip dress

Sleeveless fitted poly spandex blend. Measures 34 inches from back of neck to hem. Looks new but not sure. Selling as preowned. Black band around the neck and sleeves. Looks like a size small but tag size m. Underarm seam to seam 17 inches waist 14 inches seam to seam. Hips 18 inches sezm to seam. Hidden back zipper. Bodycon sheath style. Inventory 8 136 16