I am a civilian applicant so I won't be wearing a uniform. I plan on looking for a suit tomorrow for the board interview and was hoping to get some specifics as to what I should get? Traditional black suit? 2 piece or 3 piece? Should it be slim-fit or loose? Any other color besides black off limits? I've never owned a suit as all of my employment positions have been business casual so any advice would be helpful. Thank you in advance.