This is an AmbiteX SO1:1 one-piece dress. The color is navy, and the size is free size. The collar is removable. It has a round collar design that resembles a stand-up collar. The buttons on the sleeves are also a highlight, and the dress has a slight volume just below the elbows, making it a design-conscious piece despite its simplicity. I was drawn to the lovely design and purchased it, but I haven't had a chance to wear it and it has been stored at home. The tag is still attached.