It’s easy to feel during Fashion Week in New York — but not in Paris, Milan, or London — that it really is a fast-fashion world. On Sunday, Cos, the more minimalist unit of H&M, put on a show in Brooklyn. An hour before, Gwyneth Paltrow, standing with perfect posture in a sleeveless gray dress, greeted editors who came to see Gwyn, her rebranded line of lifestyle basics. Paltrow wanted to call her clothing line Goop, naturally, but apparently there was a potential trademark clash with Joop, the German fashion brand. The actress/entrepreneur was less certain about how to quantify Gwyn’s price point, which is from roughly $300 to $2,000, for dark pullovers, slim skirts, and chore and peacoats. She threw out “high contemporary” and then “premium contemporary.” Someone else offered “entry luxu

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