I'm not sure about the white suits for men, but I will keep an eye out for such details this time, farmer.
Women's apparel though, is quite another thing ...
Yes, lots of fetching "eye-catching hats"! Definitely. Lots of photos of them in the next day's newspapers.
As for the rest, no matter what the weather, rain hail or shine, one must wear one's specially bought "Cup outfit" on the day. (Retailers make a huge killing.) There is a "fashions of the field" contest, even. The competition is extremely fierce, I can tell you!
But I confess I've never attended the Cup myself. Never had the slightest inclination to. The holiday was always been most welcome, though! I'll be at a friends barbecue gathering this coming Tuesday. Lots of such activities will be going on all over the city.