Joah Brown Rhythm Tank Dress, size M / L. In excellent condition, lightly worn.
Lying flat I measured the chest armpit-to-armpit at about 18.25" across. Approx. 32.5" long.

Incredibly soft and comfortable modal knit dress.
High-neck racerback black modal mini dress. 
Size M/L comfortably fits sizes 6-10.
Made in USA.