COS Layered Open back Dress, size 12. Very deep navy color. In excellent condition, hardly worn. It was hard to take an accurate chest measurement due to the open back. The back band has elastic at either side for some flexibility. Approx. 50.5" long. COS tends to run small so may fit a medium best. I have the COS size chart for reference in the photos. "This slip-on dress is made from a soft woven material with a lightweight quality. A slim fit with an open back, it is finished with slits on either side and a draped inside layer."