Got an interview for a sales position on Tuesday at AT&T. What should I wear?

Black dress pants and a button-up dress shirt with some nice shoes? Or a full-blown suit? You think the suit is overkill?

I'd probably want to get a suit anyway because I've got a few interviews lined up, but what would you recommend I start with?

I'm coming from a background as an entrepreneur in a technical field and I almost never really dressed up in the past 10 years, since it's silly to do tech work in super fancy clothes, and it never really hindered me, so this is a bit of a change. I welcome any advice.

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