Longer and hotter summers are increasingly disrupting the traditional fashion calendar, prompting luxury brands to rethink their seasonal designs and raising concerns about sales of high-margin winter clothing. The industry, which has long depended on consumers purchasing autumn and winter apparel as temperatures drop, now faces delayed demand for coats and other cold-weather garments due to warmer autumns.

This shift was evident during Paris Fashion Week, where temperatures reached an unseasonably warm 28 degrees Celsius. Visitors frequently wore sleeveless tops and skirts rather than the new autumn and winter collections on display. At Louis Vuitton’s show, for instance, coats were notably scarce, reflecting a change in consumer and designer priorities.

“The whole industry should realise that with climate change and higher temperatures, the time for selling coats has shifted later,” said Pau Almar, a retail consultant with previous experience at Zara. This delay in demand places retailers at risk of excess inventory and potential markdowns, particularly as some shoppers may postpone purchases until promotional events like Black Friday.

Several designers are already adjusting their collections in response to the trend. Louis Vuitton’s womenswear designer Nicolas Ghesquiere noted that Europe’s recent record heatwaves influenced his latest lineup, which emphasized lightweight fabrics and airy silhouettes akin to swimwear. Similarly, guests at Dior’s spring/summer show in the Tuileries Gardens reportedly found autumn clothing too warm despite the presence of ceiling fans.

The impact is felt across both luxury and mass-market sectors. Retailers preparing to transition from summer staples such as T-shirts to jackets and knitwear might face challenges if warmer weather persists, forcing them to discount unsold stock. Almar highlighted the likelihood of increased sales for transitional layers rather than heavy outerwear, which traditionally generate higher profit margins.

At the Hermes runway show, fashion influencers Snehal and Jyoti Babani commented on the blurring of seasonal lines, with Snehal questioning, “Is this really fall/winter?” She added that hotter summers may further complicate the distinction between spring/summer and autumn/winter collections in the future.

As climate patterns continue to shift, the fashion industry may be compelled to embrace greater flexibility in design and retail strategies to accommodate changing consumer behaviors and weather conditions.