Ask HN: What to wear to job interview for biz dev position?

I have an upcoming interview with a nyc startup for a potential business development position. I'll be meeting with the head of biz dev and possibly the CEO. I'm wondering what to wear to the interview. I had been in the office previously meeting with some other people and the culture is casual. Previously I wore dress pants and a shirt and felt fine for the situation. However, I was there meeting with technical people and it was more of an informational context.

I'm wondering whether I might want to bring a jacket and/or tie to this next interview. I figure the guys I might be meeting with are more likely to be dressed up themselves since they meet with potential clients, funders, etc.