I suspect that the people who read Glamour magazine aren't "feminists" in the sense you mean it. The "feminists" are paradoxically both man hating and envious of men. They despise them but their remedy is to try to be more like them, to eliminate the femine in order to emulate the masculine. They don't read fashion magazines.
No, I suspect the readers of fashion magazines are actual normal women, the kind that think feminism is good so long as it means being allowed to still be feminine.
They need the magazine to tell them "dress like this to get the man you want & deserve" and "13 Ways to Satisfy Him" once you've got him....
At least that's their theory. As closely tied to reality as a 13 year old boy reading Playboy getting a date with Miss February.
Paris Fashion Week 2014
London Fashion Week 2012