Applying for a teen part-time or summer, non-professional, job is a little different from applying for a full-time professional position. Dress should be, at the least, neat and tidy. Business casual is usually appropriate. For example, khakis and a neat tucked in polo shirt would work well. Your shoes should be moderate and you should avoid extreme hairstyles or colors. Also, keep makeup and perfume to a minimum. No jeans or shorts, no tank tops, crop tops, or anything especially low cut (shirt or pants) or too short (skirt or blouse) - keeping everything professional is a must.