This is a beautiful dress and great for you taller ladies that are 5'6" and taller.  It is stunning and slimming and oh so comfortable, and it has pockets.  It is cool for summer and still so modest.  The fabric is dreamy.  It can also be worn as a top, if you leave the hemline at your waistline you will have a bubbly longer top with pockets.  The Asymetrical Design is stunning.
I am 5'4" tall, 115 pounds and usually wear an XS.  Wearing the Medium here.  Measurements are below. Please check measurements before ordering.  Dress is designed to be loose fitting and flowy.  If you like a more fitted look size according to the measurements.