From mharrsch's photostream on flickr.
It seems Countess Warwick could wear her equestrian dress to conduct almost any symphony orchestra in this dark masculine riding attire.
Keywords: Countess Daisy Greville, Countess, British, mistress, Edward VII, straight coiffure, high hat, blouse, high enclosing neckline, cravat, vest, buttons, jacket, lapels waistline, pin, gloves