A dressy scarf is an accessory that can be worn to add a touch of sophistication and style to any outfit. The term 'dressy scarf' is often used to refer to a BOA, which is a type of scarf made from feathers or fur. Boas are usually long and fluffy and come in a variety of colors and styles. They are often worn as part of formal attire, such as evening gowns, but can also be worn casually with jeans and a t-shirt.