Here is the dress seen in this image from the back.
From longliveroyalty.tumblr.com/image/100966968541. Also posted to the Dresses Worn by Maria Feodorovna Albumette here.
This dress does not have the exaggerated bustle that came into prominence in 1884 and the up turned sleeves of the late 80s.
Keywords: Worth, Worth, Maria Feodorovna (1847-1928), Prinsesse Dagmar, Princess Dagmar, Dagmar (kejserinde af Rusland), Marie Sophie Frederikke Dagmar, Мария Фёдоровна (жена Александра III), Glucksberg family, Romanov family, Princess, Empress, Russian, square neckline, bertha, lace, long close sleeves, contasting cuffs, lace engageantes, vee waistline, cuirasse bodice, collar, lace bertha, bustle, over-skirt, tassels, under-skirt, train