Jones New York Satin Slip Dress or Nightgown

Not sure if this is an unlined slip dress or a nightgown but either way it's gorgeous 😍. The satin-like fabric has a muted light bluish grey background with a navy blue and pink floral pattern. Adjustable straps are navy blue. Length measures 40" from armpit to bottom hem. Lying flat, width measures 17" from armpit to armpit. Excellent like new condition from a smoke free home.