Definitely go shopping.
I actually just went today and picked up a new black blazer for an interview I've got coming up. I'm wearing that, black slacks, and a brightly colored thin v-neck tshirt (a nice one) for mine. But you get a little more leeway with jobs in the design field. You don't have to be in classic business attire because they want you to express yourself. That's kinda the point lol.
Aaaanyway. For an insurance company I would say a dress shirt and tasteful tie (no crazy patterns and what not) plus either khakis or black slacks and nice shoes would be in order. Polos are fine for things like retail or restaurant interviews, but this is a more serious business. A polo doesn't really cut it.
And get the flannel idea right out of your mind totally. What are you, trying to hit on me? =]
Also, I realise it can be a difficult thing when you're working with next to no money (like me) to go out and buy dress clothes. But you have to think of it as an investment for your future. No one will hire you if you look like a hobo. And it's not like you have to buy super expensive things. You could even hit up the Good Will or some other second hand stores for virtually un-used dress clothes. Just have to make sure they don't look out of date or anything.
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http://img.imgcake.com/crimjpgpe.jpg Mo' buildings mo' problems
ocean kinda grew on me like a flesh eating ...fungus. -BIGPUN9999