This is a pretty, new-with-tags, floral cover-up/resort mini caftan by Z & L size extra-small.  

Fabric is 100% viscose, hand-washable. Item slips on over-the-head, no ties or fastenings. Slit at either side of hem, cutwork lace detailing at collar and down center front, fringed detailing at front. Approximate measurements are 52 inches underarm to underarm, 52 inches at waist, 52 inches at hips, 29 inches in length.