[RozzyLiu]

Can't help with the clothes because I would suggest a suit. You can't wear the uniform until you make the team.

As for the interview I would make sure to let them know how excited you are for the opportunity. If you go in all relaxed, or with the feeling like you deserve the job, they will probably take away that you really don't want it. I doubt this will be your case.

Also, I wouldn't worry about not have the PhD or masters. As you stated, they already know what your qualifications are, and they want you anyway. If they ask about this I would agree that this is your weakness, but that you are eagerly working at obtaining the distinction that would be more reflective of your abilities and know how. Just keep stating your strengths, while acknowledging your weakness, and your willingness to correct your weakness.

You'll do fine.