Most guests let their personality fly free in their outfit choices, but most of all, in their hats. Women in the stands generally wear wide-brimmed, Southern-Belle inspired Derby hats that can be decorated with silk flowers, bows, and ribbons, among other things. The most important thing is that a woman's Derby hat matches her dress. In the Infield, women wear all sorts of hats, including outlandish fascinators.
Men's Derby hats are generally solid in color and in styles that are reminiscent of the Roaring Twenties, though as for the ladies, Infield styles take on more personality and flair.
Keep in mind that the most important characteristic of a Derby hat is its originality. You may want to have your Derby hat custom made or, if you're crafty, you may want to make it yourself.