90s baby blue strapless debs dress

Absolutely stunning 90s prom dress. Brand is Bain de Nuit. Genuine 90s piece. In pristine condition. Bandeau style bust with ties at the back to cinch in your waist, boning on the inside to keep the structure. Shawl to wrap around your arms glamorously. Slit down the thigh which shoes the black lining. Label says M but it is vintage sizing so it is a modern day XS. I am a uk6 for reference and it fits me quite well, would fit a small too with the adjustable back. I am 5'5 for reference and wearing 2 inch heels.