I would recommend business casual attire, no jeans, black dress shoes, colour coordinated tie.
Dress for the position you are applying for. This is basic.
Wear anything , cause you are dealing with people that lack the skill of communication poor education background and a dehumanizing enviroment- total fail
At that time, minimum of sport coat and tie.
I wore a nice shirt and jeans.
Formals always work for an interview, ut you can also wear business casuals.