Elegance within belly dance stems from good posture. Without good posture you won't be able to achieve elegance. Below is a great infographic of how to improve your posture and what good posture looks like.
Image courtesy of: http://www.dancerhangout.com/content.php?r=496-Permanently-Correcting-Your-Own-Posture
Award-winning Turkish Oriental and Theatrical Fusion performer and teacher.