Going to walk in to a business and try and get a job.. what to wear?

So, a computer service shop opened a few blocks from my house. It has been in business for over a year, so I feel reasonably good that it might hold out. Not many small locally owned places do.

Anyway, I'm going in with the idea of pitching they hire me for marketing/web/service overflow (I have my degree in CIS, and have been building & repairing computers nearly as long as I've been a web designer and developer).

I don't want to over dress. It's a really casual shop. They need some real help with their marketing and website. I thought about wearing nice pants and a polo, but I honestly hate that look. Maybe a button down and jeans? I'm also going to check them out overall before I mention I'm looking for work.

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