Long sleeves and a curved patterned border create two independent points of interest in this rear view. The deep back finishes in a rounded line. The long sleeves look loose and partly sheer, while floral forms run over the closer body area. Below, the shape opens into a larger rear surface with a distinctly curved, densely patterned finish. That course is a visible design, rather than a confirmed condition record for an item being offered.
If the lower edge attracts you most, describe its curves and denser motif distribution. Request current close pictures of the entire border on an actual candidate, including places not freely visible in a spread overall photograph. The sleeves need their own information about length, width and ends; the broad effect of the rear view cannot answer those questions.
Obtain matching front and side views as well. Pictures of other dresses cannot establish that relationship. Ask about evidence for an older origin and any known previous alterations. If length work would be necessary, specifically include the preferred patterned finish in the assessment before committing to the item.