I was like, 'God, will I be good for that?'

Film-loving fashion designer Jean Paul Gaultier talks to Matt Mueller about his selection as a Cannes juror

Gaultier: 'I was scared by the fact that I'm not a film professional, even if I did costumes for Almodóvar' (Getty Images)

On the top floor of world cinema's most famous bunker, the Palais des Festivals, Jean Paul Gaultier, the French designer renowned for Madonna's cone bra, bringing man-skirts into the style lexicon and the torso-shaped bottles of his successful fragrance line, ushers me into the private sanctum for this year's Cannes competition jury. His blond-grey hair is spiked to attention and he's decked out in a classic French-striped top under a striped cardigan, greeting me with the enthusiasm of someone who's thrilled to be here. "I feel very 'appy," he agrees. Recalling his first meeting with the other jurors two days previous, he mistakenly calls 2012's jury chief "Nino Moretti" then laughs as he corrects himself: "But why he is called Nanni? It's feminine, Nanni, but he's not feminine!"

Gaultier is this year's wild-card juror alongside actors Ewan McGregor, Diane Kruger, Hiam Abbass and Emmanuelle Devos and film-makers Alexander Payne, Andrea Arnold, Raoul Peck and Moretti. He has served as head costume designer on Peter Greenaway's The Cook, The Thief, His Wife & Her Lover, Jeunet & Caro's The City of Lost Children, Luc Besson's The Fifth Element and Pedro Almodóvar's Bad Education, as well as doing selected wardrobe on The Skin I Live In but admits that when the festival called him six weeks ago, "I was definitely surprised. I was like, 'My God, will I be good for that? I don't know'.

"But I love cinema so my highs will be like the ones of the public. I will be very spontaneous in how I react. The thing is that I don't have anything to gain. I am not in the cinema business so I don't have to think, 'Oh, I have to be good with that director'." Gaultier is the first fashion designer to be asked, adding, "I was scared by the fact that I'm not a film professional, even if I did costumes for Almodóvar, Jeunet and Caro, Besson, it's not the same thing."

Naturally, he can't discuss any competition titles or the talent connected to them, but it's not on the cards anyway as he insists he arrived in Cannes with no prior knowledge about which films had been selected. He only discovered last night that his friend Marion Cotillard, who he dresses as well as Audrey Tautou and Catherine Deneuve, is in competition with Jacques Audiard's Rust and Bone. When I let slip that David Cronenberg's Cosmopolis is also part of the line-up, he feigns alarm: "Oh, that is already knowing too much!... My best experiences with movies have come when I didn't know what to see. Maybe I liked the poster and went because of that..." – Gaultier starts to giggle – "or sometimes I would not go because of that." Now 60, Gaultier's path into fashion began with cinema. His grandmother introduced him to Forties and Fifties French cinema, and when he was 12, he watched a 1945 Jacques Becker drama about the French fashion world, Falbalas (Paris Frills), that left a lasting impression. "When I saw the movie, I say, 'Ah! I want to do that!'" he explains. "Not to direct, not to be actor... not to be actress, either! It was about a couturier who was in love with his muse and it showed the models and fashion shows of the time and I say, 'I want to do what he is doing'. It was to do with seeing fashion moving, and also the idea of the muse."

Films have been a source of inspiration over the years, from The Great Gatsby to Once Upon a Time in the West "with the long coats", and Gaultier has had several famous muses, not least Madonna, for whom he's designed two complete tours and parts of two more. "I remember when I first met her in Paris, she had so many costumes in her show that are looking like mine," says Gaultier. "I said, 'It's better I do it for you for real.' She didn't say anything but after, she call me and say [adopts Madonna's slightly whiny accent], 'Gaultier, I'm happy for you to do that.' If she didn't choose me, I should kill the other designer she was using, hahaha!"

He has history with Cannes, too, having helped create one of its most enduring red-carpet images when Madonna, on the Croisette in 1991 for In Bed with Madonna, turned on the steps of the Palais and pulled aside her red-silk cloak to reveal the white cone-shaped bra and shorts she was wearing beneath. "... But there was so much hysteria when she arrived, so many people screaming and shouting, and she was frightened. We arrived from the Cap D'Antibes hotel in a little boat and I could see she was so scared. It was the first time I ever see her like this. It was something like a nightmare to be honest." Gaultier was wearing a black toreador outfit – in other words, defying the festival's strict black-tie dress code for men – but "they didn't say anything because I was with Madonna! She was more security than security!" He's been "rejected" from the red carpet twice since, though, once for wearing shorts with his tuxedo jacket, the other time a kilt.

Besides men in skirts and conical bras, another of Gaultier's legacies is being one of the first designers to bring unusual-looking and mixed-race models to the catwalk. "I always did that because there is not only one kind of beauty. People are so codified – it's sad," he told me a few months ago at the Rio de Janeiro Film Festival, where we sat on the rooftop of his Ipanema hotel with his friend, former model Farida Khelfa, who was presenting her French TV documentary about the designer. In the UK, of course, Gaultier is also fondly remembered for co-presenting Eurotrash alongside Antoine de Caunes. De Caunes, who speaks perfect English, put on his thick, jokey French accent. Gaultier, on the other hand, didn't fake his at all.

"I was not acting," he said. "I didn't understand that I was 'the gay one'. I didn't realise I was saying everything in a funny way. But I loved doing the show. It's a good souvenir."

And the Cannes jury will be another souvenir for Gaultier. He finds himself very taken by British director Andrea Arnold – "I love Fish Tank and she is quite funny" – and plans to see one film outside of the competition, Confessions of a Child of the Century, in which Pete Doherty plays a debauched 19th-century libertine. But the Paris-based designer mostly intends to keep a low profile during the festival. There are jury meetings to attend every other day, but the stripes-loving designer insists he will be giving Cannes' nightly round of dinners, receptions and ritzy bashes a wide berth.

"If I watch a film where I know the actor or actress or director and I go to an event for them, I won't be able to speak to them or say anything, apart from, 'Bonjour! Ca va?'" he says, laughing. "I am not an actor, I cannot control my feelings so they will know from my face what I think about their film!"