This is an out take from a full-length portrait, but the available image of the whole portrait is almost microscopic and the bodice and skirt are black set against a dark background so it is not reproduced here.
From Wikimedia.
Elizabeth Alexeievna wears a lace cap or liner inside of her hat strapped to her head. The similarity to the possibly Orléans Lady of the French court posted with this image is remarkable.
Keywords: Bosse, Elizabeth Alexeievna, Luise Marie Auguste, Prinzessin von Baden, Елизавета Алексеевна, Princess, Tsaritsa, Baden family, Romanov family, Russian, curly coiffure, feathered brim hat, lace lining, strap, neck band, chemise, rufled modesty piece, off shoulder bateau neckline, lace bertha