I can define every word in that sentence, but I have no idea what that sentence means.
A silhouette is an image where light and dark shade high light one image with respect to a back ground image.
So...she was wearing...perfectly coordinated light and dark clothing?
What!
In the garment industry and the world of fashion design, a garment's "silhouette" refers only to the shape it takes when it is worn by a person, and not to its color.