Appropriate attire for the kentucky derby?

I've always wanted to go to the kentucky derby and I finally am gettting the chance to go!! we have tickiets for the infield and I am not sure what the appropriate attire is since it's not the main grandstand. Of course I know the proper attire for the main grandstand (sundress, heels, and a sunhat) but I am lost when it comes to the infield. Please help me!!