The young royals wore heart-melting white dresses with large green sashes tied in bows around their waists.
The page boys meanwhile had matching cummerbunds atop the waistband of their smart trousers.
Pepa Gonzalez, founder of Pepa & Co and designer of Pippa Middleton’s bridal party outfits noted how the addition of a patterned sash on the girls’ dresses and cummerbunds for the boys’ outfits was a royal wedding first.
She said: “The bridesmaid and page boy outfits are classic, elegant and a hint of vibrant green print on the sashes and cummerbunds is the first time we have seen this on the children’s outfits at a royal wedding.
“The beautiful royal blue piping on the page boy shirt is a classic British and Spanish style and teamed with velvet trousers looks incredibly smart.
“When the bridal party is made up of young children, it’s important to have clothing that the children will be comfortable in to prevent fidgeting. They all looked incredibly happy and relaxed but taking their duties very seriously.”
Pepa also noted how the outfits were timeless and perfectly matched Eugenie’s bridal gown.
She added: “The Autumnal colours suited the beautiful surroundings of Windsor Castle on yet another historic occasion and are perfectly suited to a royal wedding. The look of their outfits was timeless and complemented Princess Eugenie’s stunning bridal gown.”
According to royal expert Rebecca English, their sash incorporated the colours of the Mark Bradford artwork in the order of the service and suited Eugenie’s wedding dress perfectly.
The patterned green sash also matched the large emerald set within the centre of Eugenie’s dazzling tiara.
The bridesmaids and page boys’ outfits are by Amaia Kids – a children’s wear brand loved by Kate Middleton, the Duchess of Cambridge.
Kate has previously dressed Princess Charlotte in Chelsea-based brand Amaia Kids, for the portraits she takes on her children’s birthdays.
Amaia is a classic and elegant brand for children and babies.
As it became a favourite brand of the Duchess’ it has soared in popularity.
To complete their adorable looks, each of the bridesmaids had small white flowers tied in their hair.
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