Tomorrow I’m going to see an Air Force recruiter for the first time. I don’t have the full jacket/tie business suit, but I do have a polo shirt and khaki pants. Is that enough, or would that be over or even under dressing?

I am asking this question for a friend who has an interview at 10 AM EST tomorrow (Feb 7th).

When HR sent him an email, they mentioned that the attire for the interview is business casual.
This surprised both of us because as per most (if not all) interview help websites, it says to wear a suit.

Please help! Would it be bad to show up in a suit?

I figured dressing down is bad… [as in they expect suit you show up business casual] so dressing up… in this case wearing suit when they mentioned business casual attire is better, right?

Or should he just wear a shirt, pant, no tie [business casual]
This is for a major financial company in NYC. If that makes a difference.