To wear this off - the - shoulder mermaid party dress, simply step into it and zip up the back. Adjust the off - the - shoulder part to sit comfortably on your shoulders. When it comes to sizing, if your measurements fall between sizes, it's best to choose the larger one as the elastic satin has some stretch. For maintenance, dry clean this dress to keep its shape and color. Avoid wearing it in very rough conditions to prevent snags. Store it on a wide - shouldered hanger in a cool, dry place to avoid wrinkles.