I don't find Emmanuelle Alt dresses in a particular way for the shows, she looks like that in real life (without the high heels), I have seen her many times in the street wearing the same pieces she does in street style photos. Her style is actually very typical Parisian bobo, rive gauche look, many girls and women dress more or less that way around here (save her Balmain period). As far as I'm concerned there is no deliberate individual "style copying" from the rest of the Vogue girls, just blending in a predominant style of their city's fashion crowd.
^ Thank you, it drives me crazy when people say it's a style copy! Many people dress in this way with no intention to do so to copy her! It's a chic and understated way to dress, I wish more people could understand that!