Dark floral longsleeve mini dress with waist tie (M)

I wore this beautiful mini dress to a September wedding and loved it. The top is wrap-style look, the skirt is truly quite short. Zips up at the back and then there is a tie around the waist as well. There is a button missing on one sleeve (see pictures). The fabric a lined polyester. There is no size on the tag but I think it best fits a size 6.