Dark balletcore vintage Kir dress

Beautiful design. Tank style bodice has a low scooped back and is styled at the hip with a cut out design that exposes a semi sheer flowing skirt. Skirt is fully lined. This pretty dress is just made for dancing. Excellent condition. Size 4 on tag but my mannequin is a curvy size 12 and it fits her perfectly. Black Swan vibes. Homecoming?