Samantha Cameron and the Duchess of Cambridge are widely regarded as two of the UK's most stylish women so it's hardly surprising that Melania Trump appeared to take sartorial tips from the stylish duo.

Donald Trump's 46-year-old wife was a vision wearing an off-white Roksanda dress as she spoke to the Republican Nation Convention on Monday night in Cleveland, Ohio.

The Slovenian immigrant, who became a naturalized U.S. citizen in 2006, wowed in the dress described as a 'beautiful option for the modern bride' by the e-commerce site Net-a-Porter.

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Melania Trump took to the stage to deliver remarks on the first day of the 2016 Republican National Convention in Cleveland and stunned in a £1,668 Roksanda dress just days after Samantha Cameron and the Duchess of Cambridge wore theirs

The £1,668 dress by Ilinicic promptly sold out following the model's appearance on the RNC stage.

The knee-length garment is a conservative piece, 'designed with a nipped-in waist and dramatic bell sleeves in a contrasting basketweave', according to its description.

Melania hand-picked the dress cotton silk off-white Roksanda 'Margot' dress because she 'liked it', a spokeswoman said.

'Melania will be recast as the next Jackie O. She speaks four languages, ' a Trump adviser told the New York Post.

The dress by Ilinicic retails at $2,190 and promptly sold out following the model's appearance on the RNC stage

Melania hand-picked the dress cotton silk off-white Roksanda 'Margot' dress because she 'liked it', a spokeswoman said

Republican presidential candidate Donald Trump, right, greets his wife Melania after introducing her during the Republican National Convention

London-based designer Roksanda has risen swiftly and steeply through fashion's ranks since settling in the capital in 1999.

And her ascent has been assisted by some extremely important women, all of whom have been busy filling their wardrobes with her vibrant colours and statement dresses.

Indeed, Samantha Cameron claims the title of Ilincic's staunchest fan and is often seen wearing her idiosyncratic and ever-elegant creations.

For her last appearance outside Downing Street as the wife of the Prime Minister last week, the ever immaculate and stylish Samantha no doubt wanted to leave a lasting impression.

So it's no surprise she opted for a £1,490 graphic print dress by Roksanda. Mrs Cameron wore the elegant dress with a zip front from the designer's 10 year anniversary capsule collection, to accompany her husband to Buckingham Palace as he officially tendered his resignation.

And the 45-year-old pulled off the bold print with aplomb, pairing it with black suede pointed court shoes and a patent black belt.

For her last appearance outside Downing Street as the wife of the Prime Minister, the ever immaculate and stylish Samantha Cameron no doubt wanted to leave a lasting impression

Roksanda's colourful designs are also a favourite of the Duchess of Cambridge who only last week recycled a yellow and white dress to ensure she stood out from the crowds at Wimbledon.

She first sported the frock on a visit to the Sydney Opera House on the official royal tour of Australia and New Zealand in 2014.

On the same trip, she chose one of the designer's more understated creations - a dove grey dress with an asymmetric neckline as she arrived at Ayers Rock airport.

Michelle Obama is also a fan of the Central St Martin graduate's outfits, choosing a striking geometric print dress for her final farewell to Cambodia after a five-day visit last year.

The Duchess of Cambridge only last week recycled a yellow and white dress to ensure she stood out from the crowds at Wimbledon

She also opted to wear the designer on a visit to an indigenous Training Academy in Ayers Rock, Australia, in 2014, left, and to the Patron's Lunch, an event to mark Queen Elizabeth's 90th birthday in 2016

U.S. First lady Michelle Obama wearing a dress by Roksanda at Westminster Abbey in 2011

Caroline Rush, Natalie Massenet and Samantha Cameron at the Roksanda show during London Fashion Week Spring/Summer 2016

On a tour of Westminster Abbey in 2011, the First Lady wore a purple wool cowl neck dress with a jewelled belt by Roksanda.

The Serbian-born, London-based clothes-maker, whose celebrity fans also include Princess Beatrice, Keira Knightley and Gwyneth Paltrow, serves up culottes, cocktail party dresses and colourful block heels season after season.

The designer studied architecture at Belgrade University and fashion design at the Faculty of Applied Arts before coming to London to study at Central Saint Martins.

Emma Stone, Laura Carmichael and Tilda Swinton are among the other sartorially clued-up women who appreciate her bold colour-blocking and clean, unfussy lines.