A wrap or a modern sweater is a cozy way to cover the arms when needed. An assymetrical wrap design is a style that is pleasing to the eye to many people because it usually has nice flow or drape of fabric.  Also the style feels new and fresh as it is a new take on clothing.  It is similar to a cardigan in use value. Many assymetrical garments can be convertible to other ways of wearing making for multi use.