New UNIQLO sleeveless long lounge dress 100%cotton

Brand new with tag, quality cotton fabric not thin at all, with two side pockets. Beautiful purple floral pattern for summer. Tag marked size M, pit to pit 21' (I measured). I feel UNIQLO usually runs big a little bit as I usually wear size L (sometimes M) and I can wear this. I'm 5'6", the dress length is around 1.5 inch above my ankle. Selling because downsizing. Found many beautiful clothes never worn. Hope someone can use them ^_^. feel free to ask me questions.