Though wearing a hat on derby day is a tradition, oftentimes people wonder if it's a requirement these days. In keeping with the dress code of the Royal Ascot, you should follow the rules set forth by the traditions of the Kentucky Derby if you expect to blend into the crowd. There are three different sections at the derby: the clubhouse, millionaire's row and the infield. Women who are sitting in either the clubhouse or millionaire's row are expected to wear pastel-colored dresses and hats with a spring theme. In the infield, however, it's a more relaxed atmosphere and while the same rules should apply, people in this area tend to wear crazy, gaudy hats and not dress as sophisticated.