Halter Style Embroidered Prom Dress w/ Low Back

My senior year prom dress. It’s a halter style neck line with embroidered patterns on the dress and a low back that clasps by the shoulder blades. There’s a silver accent band across the waist. The color is hard to describe but it’s a reddish purple. The closest I could get the color on the photo to real life is in the fourth picture down. The tag says size 11 but it feels like a 6. I’m super willing to provide more detailed pics or sizes if wanted and am open to hearing other offers!