And this year marks 150 years of the Kentucky Derby.

And many of the traditions we've come to know and love date back to that very first derby.

And yes, that includes the hats.

Kelsey Starks takes us to Louisville, Kentucky Derby Museum to explore the history behind what may be the Derby's most iconic tradition.

If you think about a fashionable ladies ensemble or even a fashionable man's ensemble in the 1870s, 1880s, a hat was just an understood part of a fashionable ensemble.

Really, fashion tradition was there from the very beginning.

When the very first Kentucky Derby ran in 1875.

Wearing a hat to the races or to any event was commonplace.

But the idea to make the Kentucky Derby a high fashion event was intentional from the beginning.

Lewis and Mary Clark had visited Europe ahead of founding the Louisville Jockey Club, which is what Churchill Downs used to be called.

And they traveled through England to see the Epsom Derby.

They traveled to France to go to Longchamp.

And basically those were railroad runways.

Those were places where new fashions were literally being introduced at racetracks there in Europe.

And they wanted to cultivate that elegance and that beauty and that style into their racetrack.

It wasn't until the 1960s and seventies when the everyday hat fell out of fashion, and that's when the Kentucky Derby tradition doubled down and became even more elaborate.

But another big part of it is the media.

So as media coverage increased at Churchill Downs on Derby Day, you really wanted the Courier-Journal to be taking a photo of you and saying, Oh, I got to get that in the photograph here, or, Oh, I want to put you on television.

And so you're starting to come to the racetrack and things that help you be seen in this sea of people.

Oh, it's you know, it's Kentucky Derby.

It's all about the hat.

So I love iconic movie hats.

And Rose is one I've always wanted to try to replicate.

A place to see and to be seen.

And so it remains to this day.

The Kentucky Derby wouldn't be the same without a good hat.

Yes.