Zara Tindall channels Eliza Doolittle in a stylish £1500 dress with pink buttons and a fascinator as she shields under an umbrella to support cousin William at Buckingham Palace garden party

Zara Tindall channelled her inner Eliza Doolittle in a stunning white dress at the Buckingham Palace garden party on Tuesday. 

The royal, 43, joined her cousins Princess Beatrice and Princess Eugenie - as well as the Prince of Wales, who was making his first garden party appearance this summer.  

It was Zara who wore the stand-out outfit of the afternoon, wowing in a £1,500 Laura Green London Isobel Dress in white, with added pink buttons. 

To match her ensemble, she added a stylish Rosa Boater hat and pink suede heels. 

Zara was stylish but practical in the inclement weather, adding heel stoppers to the bottom of her shoes to prevent her sinking into the ground, while a black umbrella shielded her from the rain - and looked like it was always meant to be a part of the look. 

Zara Tindall channelled My Fair Lady in a stunning white dress at the Buckingham Palace garden party on Tuesday

The gorgeous look had pink details in the buttons, a Rosa Boater hat and pink suede heels

Prince William didn't let the weather ruin his fun on the day out at Buckingham Palace

Zara appeared to take inspireation from Eliza Doolittle. Pictured Audrey Hepburn as the character in the 1964 film

Zara wore the stand-out look of the afternoon, wowing in the Laura Green London Isobel Dress in white, with added pink buttons

She was also accompanied by her husband Mike Tindall, who looked handsome in a suit and top hat. 

The display seemed to convey quintessential Britishness as the royals shielded from the rain - but crowds still flocked to the 'summer' garden party. 

William's presence, alongside the King's nieces and nephew, will inevitably be seen as a sign of family unity at a difficult time.

The cousins showed further unity by matching their stylish ensembles, as Eugenie and Beatrice also opted for a colour scheme of pink and white to match Zara. 

Charles, 75, has a packed diary with public engagements on all but one day this week, despite his wife, Queen Camilla, often urging him to slow down a little.

The pair enjoyed a visit to the Chelsea Flower Show on Monday, where they toured the garden - while Camilla even revealed she's seen the first episode of Bridgerton. 

While the King continues to undergo treatment each engagement is being carefully calibrated to balance his desire to work with his health.

Guests began to file in from 3pm in order to enjoy the tea tents and palace grounds, despite grey skies and rain.

Zara Tindall (centre) with Mike Tindall (left) during the Sovereign's Garden Party at Buckingham Palace

Despite the inclement weather, the party still went ahead with guests shielding under umbrellas

Zara managed to be stylish but practical in the inclement weather, adding heel stoppers to the bottom of her shoes to prevent her sinking into the ground

Zara channeled My Fair Lady with the look, which captivated the crowds

Prince William was joined by the The Duke and Duchess of Gloucester along with the young royals

Sister act! Princess Beatrice and Eugenie came together for the Sovereign's Garden Party at Buckingham Palace

Cousins come out! Peter Phillips was also there in support of William

Around 8,000 people are invited to each party, nominated by sponsors including Lord-Lieutenants, government departments, charities, the military and Faith groups.

The royal party arrive, as usual, at 4pm on the terrace to the rear of the palace via The Carnarvon Room.

They stood for the National Anthem before being escorted down to the lawn before circulating through distinct 'lanes' under the guidance of gentleman ushers in order to meet as many members of the public as possible. 

During the garden party William will meet guests from a number of both his own and his wife's patronages, military affiliations and passion projects including his Homewards initiative to combat homelessness, RAF Valley (the Welsh base where the prince worked as an RAF Search and rescue pilot), Swim England and tenants across the Duchy of Cornwall sites.

The inclusion of those with links to the Princess of Wales suggests that when planning for the garden party began last year it had been expected that Kate would attend.