Would shall I wear to the Kentucky Derby?

I had planned to attend the Kentucky Derby in the USA for the first time last year, but I wasn't able to. What shall I wear this year to the Derby. I have a couple of weeks to look and purchase. What is going to be in style or appropriate for this year's Derby? If you have been, are there any tips about Derby Day or what to wear? All help is appreciated. Thanks.

Would shall I wear to the Kentucky Derby?
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