Be very confident if your a BBC guy like me that there is not going to be any minor surgery on ur head of the day of the interview .
Comfortable but smart clothes and in this day and age a suit is not essential . I like suits a lot but have been to n interview shaved that morning white shirt , blue tie , waistcoat or vest and matching trousers /pants got the job . Its about showing you want that job and making the effort to look your best with a freshly shaved head , looking clean and good is about that in this day and age . Feeling comfortable you will perform well with the questions asked