Greyish Blue Davids bridal bridesmaid/Prom dress

vintage 90s/00s Very pam beesly and kat Stratford Size 6, great condition except for one small stain on the front as seen in picture 4, it's literally smaller than my pinky finger nail lol I have high hopes of getting it out but I don't want to ruin the integrity of the dress! feel free to reach out with any questions!