It’s Friday night and I’m standing in the basement of the Savoy hotel, surrounded by more than 50 people in wire antlers and candyfloss pink recycled wigs. It’s just a few minutes before Vin and Omi’s show is due to start, when the small wooden door in front of us will open on to the famous mirrored ballroom – the same one where Christian Dior held his first UK show. I don’t feel ready for the London fashion week crowd.

So unique is Vin and Omi’s brand – sustainable fashion with an inclusive message – that I and many of the other models are in fact not models at all. Next in line to me is Paris, an elegant, honey-skinned woman, who tells me only as she’s being fitted into her latex hotpants for the show that she normally works as a mental health nurse.

But there are some professionals here too. Emma Barslund-Blackman, a 5ft 11in catwalk veteran, kindly coaches me through my first (and possibly last) ever modelling gig: “Don’t look down. And remember, if you fuck it up, it doesn’t matter. It’s just fashion.”

Facebook Twitter Pinterest Anita Rani walks the runway at the Vin and Omi show on 14 February. Photograph: Gareth Cattermole/Getty Images

Unusually, these are clothes that won’t be sold. They exist purely to make an environmental statement – that the core materials used to make mass-produce clothing are damaging our planet. Looking down at the frothy babydoll dress that I’ve been fitted in, I couldn’t have guessed it’d been made from waste plastic bottles, collected during a Brighton beach clean. The way the designers have transformed them into organza-like baby blue and pink flowers that flounce as I dance down the catwalk is genuinely incredible. So too is the coat worn by the elderly gentleman to my left – its origami folds fashioned from a sail donated by Team GB sailor Hannah Mills.

Meanwhile, the Savoy’s own waste plastic bottles have been transformed into a range of boldly patterned silk-like scarves, which are knotted around models’ necks. Nettles collected from the Prince of Wales’ Highgrove estate are woven into a gothic-inspired bodycon dress, with the show’s title, Resist, running vertically down its front, in a statement of the designers’ will to combat the climate crisis. So natural is the fabric that it begins to biodegrade even as its model hits the catwalk, leaving a trail of wire-like strands behind her on the ballroom floor.

Facebook Twitter Pinterest Maddie Mills walks the catwalk for Vin and Omi during London fashion week 2020. Photograph: David M Benett/Dave Benett/Getty Images

The sustainability message continues backstage, with an attempt to limit single-use plastics and make-up wipes (though I did catch sight of a few Starbucks cups lying around – caffeine consumption is at perilous levels through fashion week). Lighting, too, has been kept to a minimum, to save energy – presenting a challenge to the make-up artists who must apply our doll-like looks in near-gloom.

But of course, the designers concede, it is impossible to reconfigure something so inherently wasteful as a fashion week show, to which hundreds of guests have travelled in taxis, tubes and buses. “We’re not perfect, but the idea is that we bring the waste down as low as possible,” says Omi. They plan to partially offset the show’s carbon footprint by planting trees this summer. Once the show’s over they’ll be back to the countryside, wellies on, collecting the raw materials for next season.