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The most important thing to be a fashion designer is expressing yourself. One must know how to express themselves in a creative way. It is also important to realize that beautiful clothes can be made without being expensive. Reading on different type of clothing materials, reading on different type of silhouettes and learning some sewing should be starting points to be focussed.
Also, don't get disappointed with few early failures but keep moving on. It takes time and hard work to become a perfectionist and thats what you should strive for. As someone once said: "The price of success is hard work, dedication to the job at hand, and the determination that whether we win or lose, we have applied the best of ourselves to the task at hand."
All the best!