Get a hair cut,...
OMG, yes!
And dress in a dark grey or blue suit, white shirt and wear a simple, striped tie. A Windsor knot would be nice. Black over-the-calf socks and black shoes would be a plus. If you're seated and want to cross your legs, do so at the knee, not at the calf.
Remember that in an interview you are following,
NOT leading. When asked a question, keep your answers to the point and as short as possible. Eye contact is important, too. Don't glance around the room while thinking of an answer to a question. And be careful of "what if" questions.
You are going to get your ass handed to you...alot...your ability to learn the true lessons from your defeats is going to define you.
That's a given that so many don't pay attention to.
The bottom line of proper appearance and deportment for a job interview is not to appear liberal or conservative, but to appear
professional.