Mara has said many times that her style has changed
because of The Girl with the Dragon Tattoo and that she really appreciates the whole gothic aesthetic more. She was in her 20s when she filmed the movie and I think your 20s is all about finding your style. Maybe she thought to herself, "Hey, I really like black!" after making the movie. Anne Hathaway said just that after filming The Dark Knight Rises. I have noticed that she's worn a lot of black or neutral colours just like Rooney Mara. Point is, I think if you're playing a character, it's very easy to see why someone can be influenced by the character they are playing. Yeah, she has worn some colourful dresses, but not lately. I think that is telling that black is her favourite colour. Or maybe it's just purely coincidental that she chooses things that happen to be black.
I follow all of those French actresses you listed and I'm almost sure they wear more colour than black... I also really disagree that she wears the same silhouettes. Look at the three black ensembles she had worn in Cannes. The Giambattista Valli & Yohji Yamamoto ensemble, the Christian Dior and the Vera Wang...all very uniquely constructed and different looks. All black. What about the Balenciaga and Valentino dresses looks in Berlin? Or the Alexander McQueen dress she wore to the Side Effects premiere?
Sorry if I came across as rude. Of course you are entitled to your opinion. The forum would be a terribly boring place without people like you.
I guess we can just agree to disagree.
FYI, I was facetious with the subscribing comment.