When Meghan Markle wore an Australian designer's $1800 white dress, the label's website crashed

Phil Noble – Pool/Getty ImagesMeghan, Duchess of Sussex, wearing her Karen Gee dress, with Prince Harry, Duke of Sussex and Australia’s Governor General Peter Cosgrove at Admiralty House at the start of their Australian tour.

The power of royal fashion choices – a trend that began under the late Princess Diana – was apparent in her daughter-in-law’s choice of dress during the Duke and Duchess of Sussex’s visit to Sydney this week.

Prince Harry’s wife, Meghan Markle, appeared in the $1800 white dress by Australian designer Karen Gee for her first official engagement in Australia, at the Governor-General’s residence, Admiralty House, before later throwing a coat over it for a visit to the Sydney Opera House.

The ABC reports that shortly after the Duchess appeared in the “Blessed Shift Dress” on Tuesday morning, Gee’s website crashed briefly and people attempting to order the outfit received error messages. The website is now working once again.

Gee posted a photo of the Duchess wearing the dress on Instagram saying “there has been an incredible amount of interest”.

The interest was global, including the USA, Markle’s birthplace, and fellow Commonwealth nation Canada.

Gee told the ABC that she knew Markle would be wearing one of her outfits, but didn’t know when and was busy getting her kids ready for school when she realised.

Gee’s dresses are popular with TV presenters, including 7’s Melissa Doyle, and she has a store in Sydney’s CBD in Chifley Plaza. The mother of five launched her eponymous fashion label in 2013.

She says it’s based on three core values – simplicity, elegance and timelessness – to help “women feel not only comfortable but confident”.

Today Prince Harry and his wife are in Dubbo visiting the Royal Flying Doctor Service, where they launched a new plane, and meeting with local school children and drought-affected farmers.

Popsugar reports that the Duchess is wearing a pair of $199 black “Harriet Jeans” by Outland Denim, an ethical and environmentally-conscious Australian brand.

Chris Jackson/Getty ImagesPrince Harry, Duke of Sussex and Meghan, Duchess of Sussex visit a local farming family, the Woodleys, in Dubbo.

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