Fab at 78: Agnes b. opening Paris gallery to show her art – think Andy Warhol and Basquiat – and add some zest to a soulless corner of French capital

French designer Agnes b. really doesn’t like the fashion world of which she is one of the great survivors.

“I don’t like fashion. I have nothing to do with that world where everyone is in a bubble,” says the veteran creator, a lifelong activist for progressive causes.

“Some people like to go out and be seen,” says the 78-year-old, who dressed her friend David Bowie for decades and who made the famous black jacket with the leather collar that John Travolta wore in the film Pulp Fiction.

Like her, Bowie would run a mile from the “celebrity scene”, she said. Both, however, shared a passion for all kinds of modern art. And now Agnes b. – whose real name is Agnes Troublé – is opening her own gallery in an up-and-coming corner of the French capital.

Fab will not only house her eclectic private collection of more than 5,000 works – half of them photographs – but will also, she promised, be a “factory of culture and social solidarity”.

Next to Station F, the world’s biggest start-up incubator in the shadow of France’s national library, Fab is a place the designer wants to put some fizz into what is a soulless corner of Paris.

Her idea is to bring the art, music, fashion and publishing worlds together with the neighbourhood’s young tech crowd and its multi-ethnic working-class residents. Even as she approaches her eighth decade, the grandmother of 16 and great-grandmother to 19 has lost none of the daring, drive and curiosity that helped her build a fashion empire of 300 boutiques, largely in Asia.

Indeed, Fab’s first show is called “La hardiesse”, or “The Audacious One”, a nod to the self-taught designer who started out in fashion as a penniless young single mother with twin boys to look after.

Back then, after marrying a much older man straight from school, the young Agnes Bourgois (hence Agnes b.) dreamed of being a museum curator.

Now she has a collection of Basquiats, Warhols, Nan Goldins, Martin Parrs and paintings by Gilbert and George that many institutions would mortgage themselves for. But Agnes b. sees herself more as a motherly custodian than a collector of artists who can fall rapidly out of favour.

The art world can be just as ruthless and as capricious as fashion. “Suddenly, no one cares about what these artists have done, and they drop them. I don’t like that,” she said. For her, a piece of art becomes “an orphan when it leaves an artist’s studio. It needs to be adopted, loved, seen and understood,” the designer said.

Born in Versailles, near Paris, into a genteel, but impoverished Catholic family, Agnes b.’s adolescence was marked by abuse by her uncle. It took her more than 60 years to tackle the subject with the film “Je m’appelle hmmm” (“I’m called hmmm”), which she wrote and directed, although she insisted it wasn’t actually her own story.

Agnes b. married the future publisher Christian Bourgois – who was 12 years her senior – when she was 17. “After I had my twins at 19, I left Christian at 21 without a penny. I was lucky to be very poor without being very unhappy. I would buy ham from the shop with the money they gave me for bringing them empty bottles. One day, one of the twins said to me: ‘Aren’t you lucky Mammy to have us!’”

The experience helped forge her social conscience, which has seen her support innumerable liberal causes in France and beyond.

“I really feel for the Rohingyas, the Uygurs and the climate,” the designer declared, adding that she is “very afraid of Trump”. With France hit by strikes sparked by government pension reforms, she worried for those who have been “forgotten”.

“Nobody talks about the cleaners or the artists who have nothing. Who is defending them?

“I am a bit of a 78-year-old Greta Thunberg,” she joked, referring to the teenage Swedish climate activist.

Her liberal Catholic faith is a comfort. “It’s pegged into me,” she said. “I don’t have that doubt even though I really like people who doubt. I need to talk to my friends in heaven.

“We are not machines or animals, even if animals have a kind of soul themselves too.”