Jessica Chastain was classic and elegant in a marigold Viktor & Rolf design at The Toronto International Film Festival.  She is there to promote her film, Coriolanus.  The one-shoulder dress complemented her strawberry blond hair because of the warm undertones.  It had side draping and a frontal knot that were in a richer jewel-tone than the body of the gown.  She accessorized with a belt that gave definition to her waist, and provided a flattering silhouette.  Her updo was the perfect exclamation point on this look.