Royal Ascot 2018: Glamorous guests don gigantic hats on first day

There is a strict dress code in operation, but that didn't stop the ladies of Ascot from pulling out all the stops when it came to their outfit choices. Both were big hat trends at Ascot this year, with women looking to outdo each other Classic elegance: This group strode into the racecourse in pastel frocks, matching clutches and ladylike gloves Heiress Ariana Rockefeller attended Royal Ascot for the first time - dressed in a pink Lela Rose skirt and top, and a matching hat by royal favourite Philip Treacy. Herself an equestrian, Ariana accessorised with Manolo Blahnik heels and a bag from her own range Pink petals: Hats, left, dresses and shoes, right, were all adorned with flowers as women got into the spirit of summer Bold and beautiful: A teal satin frock and over-the-top hat made sure this woman stood out from the crowd at Ascot Flower power! Flowers featured on dozens of different hats, either as added details, left, or as the entire look, right Fabulous in feathers: More is more when it comes to this outrageous creation, paired perfectly with sparkly sunglasses Wearable art: From delicate fascinators, left, to bird cages, centre, and full-on flowers, right, the hats certainly stole the show Here come the girls! The five-day racing spectacle gives racegoers the chance to show off some of their best looks Red alert: Milliner Ilda Di Vico, centre, hit the right note with one of the day's biggest style trends with her red hat Football fan: Kelly Brook donned an England World Cup hat as she arrived for the start of the five-day racing spectacle Floral fantasies: An enormous bloom was the perfect finishing touch to this look.