A short wide-skirt dress creates a compact upper shape above a broad flared hem. The narrow straps and shaped neckline are visible, while bright repeated details cover much of the surface. The wearer looks down in a relatively quiet stance. This view makes the difference from a floor-length narrow skirt easy to see, but the back and full fastening arrangement remain hidden. Visible decoration does not identify fibre or prove a particular internal structure.
Use the short hem as its own fitting question. Sit on an ordinary chair and check the coverage you want before deciding on the upper arrangement. Walk with your hands free and see how the skirt moves without being held. Try a bag at its real carrying height so that it does not repeatedly meet the broad lower edge. If your interest is specifically an open back, request a rear view of the same offered model rather than transferring that feature from its description. A dress can provide the front volume you like while leaving the rear question unresolved; both facts belong in your decision notes.