Katie, this wrap is a nice alternative to a blazer. It honors the roundness that is characteristic of a woman's figure. Without the assistance of a jacket's formed shoulders, however, you'll need to be more aware of your posture. Be sure to sit up straight and pull your shoulders back.
Remember, also, that black-on-black can be austere without something to soften it. Never let black wear you. Put it in its place with bold accessories, like a pin, omega necklace and "door-knocker" earrings.