I think they wear like that for the photographs because it makes very Paris voguettes crew. But also i think that Capucine and Geraldine are extremely influenced by Emmanuelle. Geraldine has almost dressed like Emmanuelle for the beginning because she is her assistant and she grew up her fashion vision and taste with Emmanuelle. Contrary to Melanie Huynh and Benjamin Bruno who have been Carine Roitfeld's assistants and the latter has let them more free and explore different visions of fashion. But the problem of clones has always been here. When you see the picture of vogue team, this is black clothes, leather, very tight clothes, high heels etc.
Finally, here in France, a big majority of girls looks like Isabel Marant's muse because it's, how say that, our culture, our style in fact.
P.S : I'm sorry if i make mistakes in English