Nick Smith, head of communications at Ascot, said: "We are delighted with the standard of dress we are seeing in both the royal enclosure and the grandstand. The new dress code has clearly had a positive impact on that.
He added: "We always said that we would adopt the new rules sensitively using common sense and discretion, especially in the first year of its implementation, and that is what we are doing."
More top news
Skies clear across many areas overnight but heavy rain moves in across Ireland.
The bomb exploded after a group of children picked it up thinking it was a toy, a relative of one of the victims said.
Cladding from high-rise flats in 25 local authority areas has now proved to be potentially flammable in the urgent safety review.