You have probably scrolled past dozens of swimsuit ads this week alone, each promising some brand-new silhouette you have never seen before. But what if the most compelling swim look for summer 2026 is not new at all? What if it was perfected seven decades ago by a woman whose centenary we would be celebrating this very year? The 1950s swimsuit – the kind Marilyn Monroe turned into an art form – is staging a full-scale return to fashion, and the runway proof is already here.

Why the 1950s are back on the runway

Designers have not been shy about telegraphing their obsession with midcentury swim. Julien Dossena at Rabanne and Chemena Kamali at Chloé both made the 1950s the driving force behind their spring-summer 2026 collections. Dossena has explained that his starting point was straightforward: a fascination with swimwear led him to explore its evolution from the 1930s through the 1950s. He noted that the bathing suits of that era blended precision with performance, their cuts shaped to follow the motion of swimming.

That research translated into floral prints reminiscent of the period, draped over dresses designed to evoke the spirit of a swimsuit. Kamali echoed the mood at Chloé, presenting silhouettes wrapped in short, structured floral dresses crafted from cotton poplin. The message from both houses is clear: the 1950s are no longer a nostalgic reference – they are the aesthetic blueprint for this summer.

And when we talk about 1950s style icons, one name eclipses every other. Marilyn Monroe, considered the original pin-up, would have turned one hundred this year. With her sensual photogenic presence and her unmistakable magnetism in front of the camera, she helped define the aesthetic codes of an entire decade. From daring editorial shoots to intimate portraits, the swimsuits she wore revealed her envied silhouette and became cultural touchstones. So what exactly did she favor, and how do those pieces translate to 2026?

Five swimsuit styles worth packing this summer

Start with the most effortless option in your suitcase: the black one-piece. It was a vacation essential in the 1950s and it has not budged from that position since. The key difference is the cut. Back then, the suit covered the hips and extended over the upper thighs. In 2026, it features high-cut, leg-lengthening lines that flatter the silhouette while keeping the same timeless appeal. Think of it as the swimsuit equivalent of a wardrobe staple you never have to second-guess.

Next, consider the black two-piece. Much like the little black dress, a black bikini is a classic that should never be underestimated. It is easy to wear and inherently minimalist, making it the go-to for anyone who prefers clean, pared-back lines by the pool or on the beach.

If you want to make a single chromatic statement this summer, go for gold. Monroe wore it in a monochrome, ultra-glamorous way. For 2026, the shade is being reinvented in a lamé finish – a swimsuit that instantly catches sunlight whether you are by the sea or beside a pool. It is bold without being busy, and it carries a dose of Old Hollywood allure that few other colors can match.

Then there is polka dots. Already beloved in the 1950s and popularized by the pin-up icons of the era, the polka-dot print brings an immediate retro touch to any silhouette. This summer, it is showing up in more contemporary versions. Dua Lipa and Kylie Jenner have both been spotted embracing the sensual character of a polka-dot bikini, proving that the pattern translates effortlessly to a modern context.

Finally, never overlook white. Jane Birkin, Brigitte Bardot, Romy Schneider, and of course Marilyn Monroe all gravitated toward white swimwear in every possible form – bikini, bandeau with shorts, one-piece. A standout piece of the 1950s, it remains a foolproof choice 70 years later. White flatters sun-kissed skin and projects a confident, luminous femininity that feels as fresh now as it did at midcentury.

How to style them with a modern edge

The beauty of these five trends is their versatility. A black one-piece with high-cut legs pairs naturally with a flowing linen cover-up for a polished resort look. A gold lamé swimsuit needs nothing more than oversized sunglasses and a straw tote to feel event-ready. Polka dots work equally well on a beach holiday and at a rooftop pool party, especially in a bikini silhouette that balances retro charm with a contemporary fit.

What the runways at Rabanne and Chloé remind us is that the 1950s silhouette was never about restriction. It was about precision – garments engineered to move with the body. That philosophy translates beautifully into 2026, where structured cotton poplin dresses and swim-inspired florals allow you to channel the era without looking like you are wearing a costume.

The takeaway for your summer wardrobe

Seven decades after Marilyn Monroe turned a simple swimsuit into a statement, her favorite poolside looks are once again shaping what we want to wear. Gold lamé, polka dots, classic black, and crisp white are not trends you need to chase – they are reliable, enduring choices backed by some of the most influential designers working today. The real style lesson here is refreshingly simple: when something is designed with that much intention, it never truly goes out of fashion. Pack accordingly.