A year before the famous hip-hop show, Lagerfeld put bike shorts on a Chanel runway. The Spring-Summer 1991 ready-to-wear was presented in Paris in October 1990, with a beach theme. Cycling shorts turned up under sequined tops, under little structured jackets, under cropped pieces in the saturated colours Chanel had not really worn since Coco was alive. The leggings-and-leotard logic that aerobics had pushed into ordinary wardrobes by the late eighties got promoted, on that runway, into the most expensive ready-to-wear in Paris.

The cast read like an inventory of the moment. Claudia Schiffer, Karen Mulder, Linda Evangelista, Tatjana Patitz, Yasmeen Ghauri, Naomi Campbell. Tim Blanks, looking back at the show twenty-odd years later for Style.com, used it as the marker for when backstage stopped being a back room. He remembered four or five camera crews at the start of the season and four or five hundred by the end of it. Whatever you call the supermodel era, this collection sits inside the moment it became a media phenomenon rather than an industry one.

What the show actually did, on the level of clothes, was harder to read at the time. Chanel in 1990 still meant something specific to the women who bought it: a quilted bag, a chain belt, a tweed suit, a particular kind of older clientele the house had spent the previous decade trying not to lose while also trying not to ossify around. Lagerfeld's job, by then, had been to keep both audiences in the room. The beach collection was an attempt at the second part. Bike shorts under a tweed jacket are not a concession to an existing customer; they are a bet that there is another customer arriving.

The reference points were sport and sportswear, not couture. An American context kept showing through, the cyclist on Venice Beach, the aerobics studio, the pop video. Lagerfeld liked to say his life was based on change, also change of mind. What was right for the next ten minutes might not be right after that. The Spring 1991 show looks now like the moment that change-of- mind became a method rather than a quip, the moment where the house's commercial heritage started getting pushed through a filter from somewhere outside Paris and let back out as something else.

The Fall 1991 show, six months later, ran the same trick at a higher temperature, piled-on chains and the line about Christmas trees. That collection took the headlines, partly because the press had caught up with what was being attempted, partly because hip-hop codes inside Chanel were a more legible provocation than bike shorts inside Chanel. The beach show stayed quieter in the record, even though it was the one that established the frame.

Looking at the Getty stills, the thing that stands out is how unforced the styling reads. The supermodels are not trying to sell you the bike shorts. They are wearing them as if cycling shorts under a jacket were already an ordinary thing for a woman with money to wear in October 1990, which it was not. By the time the next decade arrived, the experiment had hardened into a costume cliché, leggings under everything, athleticwear codes on the high street. The thing the runway did first does not always survive into the version that becomes the rule, but it leaves the imprint.

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