Trends are set either by the fashion industry or celebrities. That alone should make you weary of them. The fashion industry is fickle and often unpredictable. What it sees as acceptable today can be laughable tomorrow. Celebrities can set trends by merely being popular and the incessant desire of people to imitate them . A celebrity only matters while they remain the flavor of the month. Celebrities can outlast the fickleness of the media, but whatever trends they create during that period do not. The danger of following trends is that you are always at the mercy of fickleness which will alway prevent you from grounding yourself and creating your own style.
If you develop your style properly, away from the ever changing trends at times there will be trends that hint at your own style. Whenever this happens, do indulge a little in trends, but always make sure to get out when it has left your style. I cannot stress the importance of your own style enough. In creating your own style you find a little of yourself and bring it out for everyone to see. Trends are not create by you and therefore do not represent you, beware trends and embrace style.