Depending on the job you are interviewing for and the company's standards of dress, there is a range of possibilities. The basic outfit for a man is usually a dress shirt, dress slacks, tie, and dress shoes. This would be suitable for a man who interviewing for a number of positions. If you are interviewing for an office position, a business suit would, of course, be called for. For a woman, a nice dress or skirt and blouse worn with dressy shoes would probably be a suitable outfit.
Women can even wear a pantsuit as long as it is dressy and looks professional.
There again, the outfit depends on the job that you are interviewing for. Make sure whatever outfit you wear is clean and pressed. Remember to pay special attention to your shoes. Make sure your shoes are clean and polished. And, unless, you are applying for a job as a tennis instructor, hula dancer, or construction worker, do not wear tennis shoes, sandals or thongs, or work boots to your interview.