Two piece backless mermaid prom dress

Size 7, two piece formal gown from Windsor. Top: mock neck, lace covering sweetheart neckline with a cutout in the back. Scallops on the bottom. 1 button loop broke, fixable. Skirt: mermaid / trumpet, tulle underneath for volume. Worn 1x for a few hours- some makeup stains(pic 6) remove easily. Ask any questions you have! All measurements are approximate**Top: Armpit to armpit- 16.5in. Length- 16in. Skirt: Waist- 27in. Length- 44in [I'm 5'5 & it was a little long with flats].