With any interview, I recommend to dress to impress. Nothing too high for the position, but as high as you can go with it. I wore a polo and khakis for an interview with Burger King, mind you, but that's just my philosophy. I'd say anything from polo and jeans to dress shirt and pants would be appropriate for any entry-level position. Usually the front desk admins are wearing jeans and a polo as uniform, anyway, so it's really anywhere in that range.
Jeans and a Polo shirt will be fine.
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