[quote=Magic Magnum]
This is perhaps the most common piece of advice I ever see people give.And to add to it I say it varies on the culture of the place you're applying.You have those really stuck up places who will turn you down just cause you weren't wearing a suit when you dropped off the resume in a mailbox (Not even say for the Interview itself). Then you have those people who may think you're trying too hard if you show up all dressed up to something like McDonald's.Try not to push too hard in either direction.Don't go too, pressed, ironed expensive suit so you don't throw people off or give the impression that you can't handle any dirty work (or that you're that desperate for the Job).But do try to look professional and nice at least so people can take you seriously.
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Once again, didn't mention wear a suit. To the job interview I went to for my current position, I wore a nice collared shirt and tidy, neat dress pants with some well-polished shoes. It pays to look presentable, even if it is for something like McDonalds.