If you’re planning to go for a job interview or wanting to make a strong first-impression to an employer, you definitely want to wear the correct business professional attire. Today's business world is diverse, and there is a wide variety of interview clothing styles that are acceptable. Many recent college graduates faced with the job search process are unsure of what they should wear. Individuals searching for a job in a new sector also may not really know what to wear for their prospective employer. You should always assume that business professional attire is the appropriate dress if you are wondering what to wear to an interview.
During the interview process you have the opportunity to ask the employer the standard dress code. Many employers today prefer their employees to wear business casual wear, but during an interview they would rather see future employees to wear business professional attire.

Business professional attire shows the prospective employer that you are serious about the potential job opportunity. It also shows them that you are well groomed, which many employers hold high standards towards.
For men adhering to a business professional dress code, this means good grooming habits. Any facial hair should be either shaved off, or well groomed. Clothing should be neat and always pressed. Women should avoid makeup that stands out in a distracting manner. Hair should also be well maintained.

Never wear jeans, athletic apparel or athletic footwear. Offensive T-shirts, distracting jewelry and rips in clothing are not appropriate in a business professional dress code. Women adhering to a business professional dress code should avoid shirts that expose cleavage and back areas. Shorts are never allowed in a business professional dress code. Head wear is not permitted in a business professional dress code unless it is for religious significance.
When you are interviewing for a new job, keep in mind that you can't undo a first impression. If you dress like a competent professional, you will have a much better chance at getting the position.