Changes in fashion may change some things, like the width of lapels, the cut of pants, or the colors of blouses, shirts and ties available in the stores. Basic professional attire does not change with the whims of fashion. A good suit should last five to ten years, depending on its quality, how hard you wear it, how well you care for it, and if it continues to fit you well. You can express fashion's whims in your off-the-job clothes, and to some extent in your accessories.