Proper Job Interview attire

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wow IMO you've already started off on the wrong foot. I cannot fathom going to interview for a grown up job where I would not know this for certain before going in.

If you have to I would simply call the HR person or perhaps even a secretary and ask what their dress code is and what is expected at interviews. This isn't even close to the best method but it is a hell of alo better than guessing wrong.