Captain Craig wrote:

She was beautiful in her costume there(late 18th century/early 19th) so I'll be curious to see her in her 1940s outfits.
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Check out
Brideshead Revisited from a few years ago for her in period (well, 1920s, but that's pretty close) clothing.
I remember liking
The Duchess; it's on the lower end of Knightley's costume dramas, but it's well-made, and it sort of deconstructs what was then becoming Knightley's stock-in-trade, the spunky ahead-of-her-time girl.