While I do not have a find date for this image, it was posted by Alexander Palace Time Machine Discussion Forum poster "NAOTMAA."
This photo shows a lace overlay on Maria Feodorovna's dark dress worn in this and the last family photo.
Keywords: 1888, Maria Feodorovna (1847-1928), Мария Фёдоровна (1847-1928), Dagmar (kejserinde af Rusland), Dagmar af Danmark, Marie Sophie Frederikke Dagmar, kejserinde af Rusland, Marija Fjodorovna, Princess, Tsaritsa, Glucksberg family, Romanov family, curly coiffure, bangs, chemise, chemisette, high enclosing neckline, pin, fitted bodice, lace vest over-bodice, long close tapered sleeves, turned back contrasting cuffs, bracelets, waist sash, vee waistline, A-line skirt, lace over-skirt