Rachel Gilbert black and white beaded gown size 6

Old Hollywood glamour is here! This gown is beautiful. It’s beaded with black detail silk sheath under off white silk. I’ve worn this dress twice but I’ve had it for years. It says it’s a 6 but it feels MUCH bigger like a 10 maybe a 12. It’s also very long. I’m 5’10 and it drags on me. The first photo I think I was a 14 and now I’m thinner it doesn’t fit me. There is some slight wear by the zipper. It needs stitched. (Photo attached) no reasonable offer refused . Thanks for looking.