I thought I didn’t really care about what people showed up to the hospital wearing for their interviews. Then, a CRNA candidate showed up in yoga pants and a sweatshirt. No matter how the interview went, I couldn’t forget how unprofessional that seemed. It made me concerned for how she would present herself later on, if that was her idea of how to make a first impression. I suspect I would uncover even more of my prejudices if it was an MD candidate.
Dress at a minimum in nicely matched business casual, and on the other end you will never be downgraded for overdressing for the interview. Of the past 10 interviews for MDs that I have done, only 1 has not worn a suit/sport coat. I can’t remember how many wore ties, but would guess a little over half.
The dinner, just aim for what would likely be the nice end of dress to be seen at whatever restaurant they pick.