A new dress code at the racecourse demands for heads and shoulders to be covered.
Dressed in smart purple outfits and carrying hampers containing pink, turquoise or white hats -- for uncovered heads -- and pashmina-type shawls -- for bare shoulders -- as well as a selection of ties, they patrolled the entrance to the Berkshire racecourse.
If anyone was spotted flouting the regulations, which have been tightened up this year, they were discreetly taken to one side and given an accessory for free.
Alternatively, women could select a hat to hire for a £50 deposit in an office at the main entrance.
Mrs Jenny Middlemass, part-owner of Polski Max which was racing in the Windsor Castle Stakes, said: "I'd only found out on Saturday that I was coming here and hadn't realised I would be going through the Royal Enclosure to get to the owners and trainers area -- and would need a hat.''
She was happy with the black and cream hat she came out with as it matched her cream outfit perfectly.
The new rules state that in the royal enclosure, fascinators are no longer deemed acceptable. Women are also expected to wear skirts or dresses of "modest length" which fall just above the knee or longer. Men have to wear a suit and tie in the grandstand and morning dress in the royal enclosure.
The dress code assistants made a bee-line for model Anneka Tanaka-Svenska who was wearing a strapless short white dress with pantaloon trousers and an elaborate bird cage-style hat. It was not clear if she was taken aside for her dress being too short or because her shoulders were bare. Luckily she had a spare outfit to change into.