Purple Embroidered Button-Down Maxi Dress

I bought the dress at a vintage market with the tag already cut out, so I'm not sure of the brand or size. Fits a large Pit to pit: 18" Waist: 17" Length: 50" There's a little bit of wear and tear on it, but all easy to fix. Just needs the replacement button (inside dress) sewn in where one is missing, and one strap needs to be mended where it attaches to the bodice on the back.