Across the board, interview attire is the same as for a job candidacy--formal and conservative. For the men out there, that means a dark suit (no pinstripes), conservative tie, closely shaved, smelling good, and shoes shined.
For the ladies, the rules are a little more bendy, but "formal and conservative" is still the mantra. Dark skirt/slacks/suit, modest monochrome blouse, heels, and limited, tasteful jewelry. I think. (I'm not as well-versed in women's dress, obviously 😛 )
Any other ideas?