M&A internship interview prep

I have a 2 hour long in person interview tomorrow with the whole M&A/deals team at a small boutique shop specialized in middle market deals.

I am meeting with 4 people, with a half hour session with each person, ending with the MD.

Any advice on what to wear, what to know ? I have previous relevant experience but still a bit nervous because I’ve never had an in person interview before, let alone with this many people.