The term 'ornamental accessory' can be summarized by the crossword solution 'SASH, ' which is a four-letter word. A SASH is a long, decorative band of fabric that is worn around the body or over the shoulder. It is often used to add color and style to an outfit, and is commonly seen in traditional clothing such as kimonos and saris. Sashes are also used in formal occasions, such as weddings and proms, to add a touch of elegance.