After starring in the year’s biggest wedding back in May, the Duchess of Sussex was merely a guest at a friends’ nuptials on Saturday, but she still managed to spark some fashion controversy.

Meghan was in attendance as Prince Harry’s childhood friend Charlie van Straubenzee married Daisy Jenks, and she wore a pleated shirt dress by Canadian brand Club Monaco, teamed with a black hat, clutch bag and heels.

While the midi-length frock, which was black at the top with green, white and pink panels on the skirt, had a lot of fans online and sold out within hours, some people have questioned whether such a dark outfit is appropriate for a wedding.

Meghan and Harry
Meghan and Harry

"This looks more like a funeral," Tee_cota821 posted on Instagram.

"What is she wearing?" asked Edition_specials. "More like a funeral attire than a joyous wedding! Just grotesque."

The.vip.association commented: "Totally wrong choice for a summer wedding… OMG who’s the stylist?"

Others stepped in to defend Meghan’s choice and there was a lot of debate about whether the dress was actually navy or black.

Belhernan pointed out: "Nobody criticised Victoria Beckan for showing up at H&M [Harry and Meghan’s] wedding in a navy blue dress. And she is a designer. People. It is OK to wear navy blue to a wedding."

David Beckham and Victoria Beckham arrive at St George's Chapel at Windsor Castle before the wedding of Prince Harry to Meghan Markle on May 19, 2018 in Windsor, England.
David Beckham and Victoria Beckham at Harry and Meghan's wedding

To settle the issue once and for all we turned to fashion expert and shoe designer Aruna Seth who spoke on the UK's wedding etiquette - same rules apply to Ireland.

"Generally, the UK wedding etiquette is no white and no black," Seth says. "Especially black at a summer wedding is a big no-no.

"Meghan should have chosen a nice pastel colour or a floaty, floral dress – this would have been more summer wedding appropriate."

"We have yet to see Meghan choose something feminine and girly, so it would have been more exciting."

Meghan Markle
We love Meghan's look

Is wearing black still taboo to a wedding?
While everyone is entitled to their opinion, we absolutely love Meghan's style and think she can pull off just about any look.

Although we would usually choose colourful attire for such a celebratory occasion, especially in Summer, we are strong believers in wearing whatever you feel comfortable in.

Many a wedding guest has rocked a little black dress in their time and looked all the better for it. Simply follow in Meghan's footsteps and maybe just add a pop of colour and Summery accessories.

P.S. Never ever wear white - that really is still really taboo.