Sergei looks like a denizen of 1890s Wall Street.
From the-last-tsar.tumblr.com/tagged/elizabeth+feodorovna/page/15.
Ella’s bodice has a partlet section with a wide tab extending into it from the bottom. Her bodice also has a square stomacher section.
Keywords: Grand Princess Elizabeth, Princess Elisabeth of Hesse and by Rhine (1864–1918), Grand Princess Sergei, Ella, Princess, Grand Princess, Hesse family, Romanov family, Princess, Grand Princess, Russian, hat, earrings, partlet, high enclosing neckline, bodice, square neckline, long tight leg-o-mutton sleeves, stomacher, belt, natural waistline, A-line skirt, parasol