Attire didn't seem to matter too much. I went with "business casual" and that seemed to make me over-dressed most of the time.
The interview process was a bit of a gong-show because the president and my supervisor (who was subsequently fired for not doing any work after I'd been in the job about a month) didn't have a clear picture of what they wanted with the position. After the supervisor was fired, the president "officially" took over the role of being my supervisor, but he was never around, and never helpful. He apologized for being "hands off" but still reprimanded me whenever I made the slightest mistake (even if I explained to him that I made the mistakes because I was stressed out). I remember the supervisor being overjoyed at the prospect that I could (if given the right tools) make the library's catalog system work better, but I was informed that there was no budget for this after I had accepted the position. Also, there was no way that the system was going to change because of the fact that the other managers were set in using the dysfunctional software and refused to change.