One Size Fits Most. Fits best on size medium on up to size 1X. Dress measures 54 inches long from the top of the shoulder to the bottom of the hemline. The dress will fall longer when it is worn off the shoulders. The body of the dress has plenty of stretch. This fabric will stretch to fit. Please keep in mind that the dress is form fitted and is design to fit tight mermaid style. We feel it will fit up to size 18 or 20 comfortably. Great stretch. Wear on or off the shoulders. Dress has kimono sleeves. Made with cotton fabric and plenty of elastic for a comfortable stretch, it hugs your figure in all the right places. Plus, it even has side pockets for convenience. Command attention with confidence in this dynamic dress! Mermaid style and very form fitting.