Regardless of the type of job you're interviewing for, that first impression should be be a great one. When dressing for an interview for a professional position, dress accordingly in business attire.
If you're applyng for a job in a more casual environment, a store or restaurant, for example, it's still important to be neat, tidy, and well-groomed, and to present a positive image to the employer.
Here's more on what to wear to an interview.
