THERE was a collective gasp when Meghan Markle arrived at St George's Chapel to wed Prince Harry, wearing a meticulously crafted Givenchy gown with a five-metre train.

But not everyone said "yes" to the dress.

Channel Nine presenter Allison Langdon, who hosted the network's coverage live from Windsor, told viewers her first thought upon seeing Meghan was that she had copied the look.

"It was Princess Mary. My first thought was that we had seen the dress before. I don't think she'll be setting wedding trends," she said, according to the Daily Mail.

"I think she did copy Princess Mary. It looked stunning on her but she went with pure white," she continued.

"A lot of people thought she might go with an ivory number since this was not her first wedding."

Australian-born Princess Mary, formerly Mary Donaldson, also wore a boatneck-style dress when she married Denmark's Prince Frederik in 2004.

Meanwhile, Channel Seven was slammed by viewers for their coverage of the wedding of the year.

Some viewers said the coverage, hosted by Melissa Doyle and Michael Usher, was not well-researched enough. They were also criticised for at times blocking the camera's view.

"Really disappointed by the quality of the Channel Seven coverage. No evidence of research. Nauseating guest commentator," one person said.

"I wish Channel Seven could tell us who the guests are," another critic lamented.