Ladies Day, on the third day of Royal Ascot, is a major fixture of the social season.
Tens of thousands of women headed to the Berkshire race course, with tickets for the far side of the track sold out.
Model Sophie Anderton was among those vying for the most outlandish head attire.
The dress code is strict. In the Royal enclosure a hat must be worn, strapless dresses are banned, midriffs must be covered, and trouser suits, of full length, must match.
Men also have to toe the line if they want to join the Royals. They must wear either black or grey morning dress, including a waistcoat, with a top hat.
Race-goer Rachel Littlejohns, wearing "watercress sandwiches", attracted plenty of attention.
Officially Gold Cup Day, Ladies' Day is traditionally the busiest day of the five-day meet.
The first race meeting ever held at Ascot took place on Saturday 11 August 1711 - and after 295 years it is still as popular.