I love the colour of Mathilde's green suit, it's nice and refreshing for November, when most people are starting to wear more darker colours. That particular shade of green also gives off a rather vintage/WWII feel to me. However, I'm not a fan of the buttons, and there's something a little off about the fascinator IMO. But, she looks trés chic.
In regards to her second outfit, I'm not a fan of her top, but that might be due to the fact that I've never been a fan of leopard or other animal prints on clothing. I love her skirt however.