With regard to the dress code, one of my friends called and was told, "Wear what you think is appropriate." I've never gone tie-less to an interview, so I went with what I knew. 10 of 11 in my group wore ties. Not everyone wore suits (I didn't), but I wore a jacket, slacks (didn't match jacket) , button-down shirt (not white) and tie. Apparently it didn't count against me too bad.