From fashion-iconography.net :
American Mademoiselle was last published by Conde Nast as a monthly. Mademoiselle has gone through several changes since the 1950's, keeping pace and in some cases, pushing, change with Feminism in the USA. For a long time, Mademoiselle had been the voice of women FOR women, often focusing on politics, health, and just about anything of interest to women. Basically, it was a Renaissance magazine that took itself seriously enough to gain recognition by literary writers, but also understood humour and the light-hearted side of women. Sylvia Plath got her start at Mlle with it's famous fiction contest, while writers Joyce Carol Oates, Peggy Noonan, and even Ray Bradbury used it as part of their start in public writing. IMO, Mlle would still have an audience if they had stuck to their guns with honest journalism that focused on being a well-rounded woman, not just a sexy man-pleaser. By changing their focus to more shallow topics, they insulted their readers and while that worked for other magazines (because they weren't too smart in the first place), Mademoiselle's legacy just wouldn't allow a dumbing down without the death of the magazine. In essence, they lost their legitimacy. Mademoiselle had been around since at least 1936.