It depends on what you are applying for, lets assume your going for something to media/marketing,, at that point a normal formal suit isnt your best friend because you must market your marketing skills and it all shows in Personality, Styles/Wear & Professionalism. In other words, wear to impress and add to your creative space & speech.
I believed that wearing the proper attire or dress cose like formal is one key to impress the client and to show them that you are willing to be a part of thier work force.
Formal suite or formal national dress, be formal.
Help job seekers learn about the company by being objective and to the point.
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