The fitting room at 5 avenue Marceau, 1966

The fitting room at 5 avenue Marceau, 1966. Catherine Deneuve stands in a smoking jacket, shoulder seams still pinned, while Yves Saint Laurent circles with chalk in hand. He marks the lapel where it wants to fall, not where convention says it should. Deneuve doesn't move. She understands that the jacket is borrowing from men but belongs to no one else.

This is how Saint Laurent worked: not by imposing a silhouette, but by watching how a particular woman moved and building the garment around that movement. The house didn't dress archetypes. It found three women whose presence was so specific that the clothes became inseparable from them. Catherine Deneuve, Betty Catroux, Loulou de la Falaise. Each gave Saint Laurent something different. Together, they gave the maison its vocabulary.

Deneuve: The Discipline

Catherine Deneuve didn't need fashion. She was already the face of Belle de Jour, already untouchable in that blonde, composed way that French cinema requires of its leading women. But she understood what Saint Laurent was offering: a wardrobe that worked like armour without looking like costume.

The smoking jacket, introduced in 1966, was the clearest example. Saint Laurent had been thinking about androgyny since his time at Dior, but it took Deneuve to make the idea legible. She wore the tuxedo to premieres, to dinners, to the kind of events where other actresses arrived in gowns that required assistance to sit down. The effect was immediate. Here was a woman in menswear who looked more feminine than anyone in tulle.

What made the partnership work was restraint. Deneuve didn't perform in the clothes. She wore them the way you wear a good coat: as though it had always been there. Saint Laurent responded by cutting closer, by removing anything decorative. The 1969 safari jacket, the 1971 peasant blouse, the endless iterations of the Le Smoking—each piece assumed Deneuve's discipline. She became the house's anchor, the woman who proved that Saint Laurent's clothes didn't need theatre to hold attention.

The relationship lasted decades, long past the initial campaigns. Deneuve continued to wear Saint Laurent to film festivals, to public appearances, to the kind of functions where fashion is scrutinised frame by frame. She never looked like she was trying. That was the point.

Catroux: The Edge

Betty Catroux was the opposite of discipline. She was all limbs and cigarettes and the kind of angular beauty that photographs better in motion than in stillness. When she met Saint Laurent in 1967, she was married to a decorator, living between Paris and New York, wearing men's shirts because women's blouses didn't fit her frame.

Saint Laurent saw immediately what Deneuve couldn't give him: permission to go further. Catroux was taller, thinner, more androgynous. She could wear the clothes in a way that erased the boundary between masculine and feminine altogether. The smoking jacket on Deneuve looked like elegant rebellion. On Catroux, it looked like inevitability.

She became his closest friend, the woman he called after every show, the one whose opinion mattered more than the critics'. But the influence wasn't one-way. Catroux pushed Saint Laurent toward the pieces that defined the 1970s: the high-waisted trousers, the silk blouses worn open to the sternum, the platform boots that turned the Le Smoking into something you could wear to Studio 54. She understood that Saint Laurent's tailoring was precise enough to survive excess.

The house's 1971 collection—the one that nearly bankrupted the business because it was too far ahead of what buyers wanted—was essentially Catroux's wardrobe. Wide-leg trousers in crêpe, blazers with exaggerated shoulders, blouses in prints that referenced Diaghilev and the Ballets Russes. It flopped commercially. It became canonical five years later.

Catroux never modelled professionally, never appeared in campaigns. Her influence was private, visible only in the way Saint Laurent's clothes became sharper, more uncompromising. She gave the maison its nerve.

De la Falaise: The Decoration

Loulou de la Falaise arrived in 1972, hired as a design assistant but functioning more as a kind of aesthetic compass. She was the daughter of a French count and an Anglo-Irish model, raised between London and Paris, fluent in the visual language of both cities. She wore vintage Dior with Moroccan jewellery, mixed patterns the way other people mixed drinks.

Saint Laurent, who had spent a decade refining a vocabulary of clean lines and borrowed menswear, needed someone who could reintroduce ornament without tipping into costume. De la Falaise understood decoration as a form of intelligence. She knew which prints could sit next to each other, which colours would read as sophisticated rather than garish, which accessories would finish a look without overwhelming it.

The house's jewellery line, launched in 1972, was essentially de la Falaise's vision: oversized gilt cuffs, Maltese crosses, ropes of faux pearls that looked better than the real ones. She treated costume jewellery as seriously as Catroux treated tailoring. The result was a house that could do both—the severe smoking jacket and the armful of bangles—without contradiction.

De la Falaise stayed at Saint Laurent for decades, long enough to see the house change hands, long enough to watch ready-to-wear eclipse couture. Her influence is harder to quantify than Deneuve's or Catroux's because it was cumulative: the way a print gets refined over six seasons, the way an accessory becomes essential without anyone noticing when it arrived.

She gave the maison permission to be decorative again, but on terms that Saint Laurent controlled. The embroidery, the beading, the prints that referenced Matisse and Mondrian—all of it passed through de la Falaise's hands before it reached the atelier.

The Inheritance

When Hedi Slimane took over the house in 2012, he removed the 'Yves' from the name and built his first collection around a different kind of woman: younger, harder, dressed in leather and denim. The Deneuve-Catroux-de la Falaise triangle seemed irrelevant.

But the vocabulary remained. The smoking jacket, the safari, the blouse worn open over high-waisted trousers—every creative director since Saint Laurent has returned to these pieces because they were built around women who knew how to move. Anthony Vaccarello's current collections lean into Catroux's androgyny, into the idea that Saint Laurent's tailoring works best when it's worn with a kind of careless precision.

The three muses didn't define the house by sitting for portraits. They defined it by wearing the clothes until the clothes became theirs, until it was impossible to imagine a smoking jacket on anyone but Deneuve, a silk blouse on anyone but Catroux, a gilt cuff on anyone but de la Falaise. Saint Laurent understood that fashion doesn't become iconic through repetition. It becomes iconic when a particular woman makes it look inevitable.