I think that previous to the job interview can impress most the degree qualifications and the work experience, this premises can do that you would be selected to made the interview, but in the properly act of the interview I think the appearance is the first impression you will do to the interviewer and for that it’s important, but the thing most important in your job interview a think is your personality and your capacity to show it.
One interview is oral communication and is very important to transfer not only your knowledge but also your capacity to work, personal and with others to make a good team.