Fashion plays in human life is strongest. It's how people see us, often has an impact on how we perceive. What is worse than a bad first impression, which impinges on subsequent knowledge. That is why for centuries people care about their appearance, image, follow the recommendations of fashion. Were this not done, would not be accepted in society.
However, do not exaggerate. On the street you can meet so often. "Fashion victims" who were not restrained in a tune, or worse, badly interpreted the currently prevailing fashion. We meet with such people are reluctant, in my mind criticizing: "This is no taste." An example of a person having zero sense in matters of fashion is an American Paris Hilton, whose costumes can often spice of vomiting. Mixture of 'fashion evening dress, plus stylish sneakers can be likened to a mathematical principle of "two pros give less" - simply can not look at it.
Elegant dress can also be fashionable. I think the conclusion is simple: you must have a sense of where fashion ends and where it begins kitsch, and know how to dress fashionably, yet elegant.