You only get one chance to make a good first impression at an interview, so make it count!
Your appearance is more important than you might think, whether you look smart and professional, or a complete mess, can have a massive impact on you getting the job. We all know that turning up in ripped shorts and flip flops is a definite no-no, but it may depend on the profession and company as to the appropriate attire. It’s always important to be dressier than the dress code of the company you are interviewing at, if the office is smart-casual, ensure that you are dressed smartly. In most circumstances, a suit may be necessary, but may be out of place dependant on the job you are interviewing for.
It is important that you both look and feel confident during your interview, so wear attire that feels comfortable, and that fits you well. Avoid bright colours and loud prints, you want the interviewer to focus on you during the interview, and not your flamboyant dress sense. Ensure your clothes are clean and ironed, and ensure that you are well groomed.
And last of all, good luck with the interview!
It’s true that in most industries — not all, but most — you should wear a suit to an interview. And even in industries where it’s not necessary, there are still plenty of interviewers who prefer/expect it.