Quasi-interview etiquette

[hedgequant]

Ok...so, here is the set-up:

I'm going to be in Boston and one of the professors I've been in contact with said it would be nice if I could stop by and 'chat', and I am going to (obviously) make sure that happens. My question is, given that this is not a formal interview per se, should I do the full suit-and-tie routine, or sport coat, or what makes the most sense?

[rising_star]

I wouldn't bother with a full suit and tie or even a sportcoat. Business casual.