Her article in thepeerage is here. She was Luise, Duchess of Manchester’s, youngest child.
From wikitree.com/photo/jpg/Montagu-209; removed monocolor tint. Also posted to the Belle Époque - 1890 to 1914 Album here.
This is a busy dress with an over-bodice and a triangular apron-like over-skirt. The bodice lacks the pronounced pouter pigeon shape of earlier years.
Keywords: Barnett - H. Walter, Alice Maude Olivia Montagu, Countess of Derby, Montagu family, Stanley family, Countess, British, Lady-in-Waiting, Queen Alexandra, curly coiffure, choker necklace, under-bodice, modesty piece, trapezoidal nackline, elbow length under-sleeves, bows, ruffled cuffs, bracelets, pouter pigeon bodice, vee décolletage, close elbow length over-sleeves, floral bodice ornament, waist sash, natural waistline, ruffled over-skirt, close under-skirt, gloves