Research the company
Before you talk to a company, find out all you can about it and the position you are interviewing for
Browse the company website, brochures, etc.
Find out who will interview you
This is important so you can find out about them; maybe they graduated from Ohio State, or you have something else in common; also so you know who to ask for and who to follow up with
Dress professionally—yes, a suit
It is always better to be overdressed than underdressed
No white socks
Pressed shirt
Belt
Appropriate-length skirts