IF you've been to one of the Disney parks recently, you may have spotted groups of guests wearing identical clothing.

But far from being on a hen-do or part of a birthday brigade, they're actually taking part in a fashion trend that's known as the "Osoroi Code".

3 Groups of friends are now intentionally dressing the same Credit: Alamy

The trend, which is most frequently spotted in Tokyo Disneyland in Japan, is slowly making its way around the world.

Translating loosely to mean "co-ordinate" or "matching", it is much more than simply wearing a similar top and trousers.

Couples, friends and families are seen dressing exactly alike from head to toe, in either themed outfits or casual attire.

Examples include couples wearing the same printed trousers, T-shirts and shoes, or friends wearing identical accessories such as headbands, bags and sandals.

Wearing the same outfit as someone else is often considered a faux pas, especially in Western society.

For example, a Zara dress caused a storm after hundreds of people were spotted wearing it.

But the Osoroi Code is making matching outfits cool - and the trend can now be seen in Disney parks in the US where groups of guests have started dressing the same at Disney World and Disneyland Anaheim as a way of having fun together.

Instagrammer Trang Dong, from the US, explained to Sun Online Travel why she dresses "osoroi" with her friends.

The 21-year-old said: "Personally, I think that matching outfits is a fun way to put a twist on the traditional matching family vacation t-shirts.

"It's kind of a fun way to show the world 'hey look at me and my friends, we're cute and coordinated.'

3 Trang Dong spoke to Sun Online Travel about why she dresses the same as her friends

"We usually pick some sort of theme to work off and pick outfits from there.

"We've used The Little Mermaid theme with Flotsam and Jetsam, or John-Hughes-esque outfits, inspired by Japan's osoroi code."

According to Japanese website Wowsabi: "Osoroi code people say that wearing matching outfits are (sic) an expression of their love and closeness with their partners or friends.

"For them, half the fun of the trip [to Disneyland] is planning what to wear together."

Trang also explained that other park guests have reacted well to seeing groups of people dressed identically.

She said: "Usually reactions are very positive.

"People tend to be impressed that a group of adults can be this coordinated.

"But most people love seeing matching outfits. I think because there is a certain charm and kinship with someone when you match your outfits, whether that be inside walls of Disney Parks or beyond."

3 Groups of girls dress up in matching outfits throughout the park Credit: Getty - Contributor

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You can also wear the same thing as your pets thanks to a new Disney line, which matches your dress to your dog.

Another weird Disneyland trend is a purple wall where millennials have been flocking to take pictures.

The hashtag #purplewall has had hundreds of thousands of posts to date.