As Dawn stated, a good dress jacket can make a big difference. I don't think you need to go to the Nineth, though. The idea behind dressing for the part or dressing for success, is to command a certain amount of reaction or respect. People (for the most part) form views of what someone has on - police uniforms command respect (for the most part), same with military uniforms. Now think of the Red Green post above, suspenders and plaid - says layed back and not taken seriously . . .  In your new posistion, I think a nice jacket will give the idea of your posistion and you want to be taken seriously. I most likely wouldn't ware a tie - unless the prefessionalism of the board is set up that way. Farming is a profession and I agree, in your new role, protray it properly. Dressing for the part (costume) makes the difference between believible and someone that doesn't know much.
I have witness a very well dress/coffed professional - he then spoke and there would be no amount of costumeing that could've help him. If he'd just keep his mouth shut - he could have fooled them all . .. .   lol

Now, where is town? Where do you go in your location for such? Or do you head down to Minnesota (Duluth, or Mpls)?