Vintage purple/lilac dress with pearl beads and rhinestones in EUC

Looks homemade but beautiful quality! Lined bodice. Zipper in back. Belt with snap button at back and bow in front. Decorated with pearl beads and rhinestones. None seem to be gone! Thicker nylon. Im a size 12 and its too small so guessing its a size 8-10. 19” pit to pit. Waist 14” Length-nape of neck to bottom hem = 36”. I think it lands just above the knees. May be a mini dress. Has a thread pull in back (see photo)