Last year, pieces from their sustainable fashion collections were housed in the permanent collection of London’s prestigious V&A museum.

Omi said their approach to the collaboration they have with the King is “holistic”, based on shared values and a shared lifelong commitment to the protection of the natural world.

“We have no other motive except for creating this awareness for the environment and we’re not selling anything, we’re not commercialising the King’s properties,” he added.

Vin said they had thought Charles would “move on” once he ascended the throne last year, saying they thought he would not “really want us traipsing around his gardens” anymore.

However, to their delight, he has urged them to expand their search for waste materials to his other properties around the country.

“He was really happy for us to go to Sandringham, so that sort of started off and we may look at Windsor as well and we may develop his other estates,” Vin told The Telegraph.

“It’s a real collaboration that works and I think he’s open to us really pushing the boundaries of what you can do with waste management in estates.

“Anything that they throw away now the gardener will ask us if we want it,” Vin added.

Georgina Ripley, principal curator of modern and contemporary design at National Museums Scotland, said: “We are delighted to have commissioned this striking piece for the national collection and we look forward to revealing it to visitors in Beyond the Little Black Dress.

“Fashion is one of the most energy-consuming, polluting and wasteful of modern industries. In response, contemporary designers are seeking more sustainable solutions, like this nature-led approach from VIN + OMI.

“Their ‘LBD’ challenges us to resist the mainstream and place the environment at the forefront of our fashion choices.”

Beyond The Little Black Dress, which runs from July 1 until October 29, will bring together more than 60 looks from collections and designers around the world.