Sydney Sweeney Powers the Women’s Boxer-Shorts Trend as Underwear Meets Outerwear

Boxer shorts are the new fashion buy

Sydney Sweeney has made boxer shorts look less like something you hide in a drawer and more like the smartest thing you can put on when the temperature rises. The appeal is immediate: they are easy, breezy, a little cheeky, and just tailored enough to feel intentional instead of accidental. What started as a niche underwear-as-outerwear move now reads like a real wardrobe option, not a stunt.

That matters because the look has moved far beyond one celebrity moment. It sits at the intersection of comfort dressing, heat-wave practicality, and designer approval, which is why it feels so current. The boxer short has become the rare trend that can look cool on the street, in a campaign, and on a runway without losing its ease.

Why the trend stuck

The boxer-short boom did not appear out of nowhere. W Magazine called underwear-as-outerwear a sleeper-hit trend of spring 2023, and said it showed up across nearly every runway that season. By spring and summer 2024, the look had shifted from whisper to signal, with fashion editors and designers treating it as part of the broader no-pants movement.

Miu Miu helped make the silhouette feel legitimate rather than merely provocative. During its Spring/Summer 2024 show in Paris, the brand continued its fascination with exposed waistbands and shorts worn low on the hip, a styling language it had already been exploring in Spring/Summer 2023. That low-slung ease gave boxer shorts a sharper fashion identity: less sleepwear, more deliberate slouch.

Calvin Klein pushed the other side of the argument, stripping the look back to minimal branding in its Spring 2024 underwear campaign and putting boxer briefs back in the spotlight. Together, those references made the trend feel bigger than one product category. Miu Miu gave it fashion nerve, Calvin Klein gave it mainstream clarity, and WWD captured the shift by calling boxer shorts a major summer 2024 trend and describing it as "boxer shorts for all."

Refinery29 also caught the tension at the heart of the look: designers embraced a no-pants approach for Spring/Summer 2024 that made the style more wearable and more divisive at the same time. That is exactly why it works. It feels new enough to notice, but familiar enough to wear.

Sydney Sweeney gave the trend its mainstream proof point

Sweeney’s role in the boxer-short conversation has been especially useful because she makes the look feel current rather than niche. She was reported to have worn visible boxers in New York City on February 9, 2026, and the pair was tied to her newly launched lingerie label SYRN. Marie Claire described that outing as her first public take on the peekaboo boxer trend beyond Instagram after the brand launch, which gives the styling moment real weight.

What makes her version compelling is the balance of softness and swagger. Marie Claire read the look as a revival of peekaboo lingerie with an androgynous edge, and that is exactly the sweet spot the trend has found. It is feminine without being fussy, relaxed without looking lazy, and confident without needing a high heel to sell the idea.

Sweeney is not alone in giving the silhouette momentum. Coverage of the trend has also pointed to Zendaya, Jennifer Lawrence and Bella Hadid as part of the celebrity cohort helping normalize women’s boxer shorts. That matters because trends become useful only when they start to feel repeatable, and repeated sightings from recognizable names are how a runway idea turns into a real shopping habit.

What makes a fashion pair look intentional

A fashion boxer short does not have to be complicated, but it does have to look considered. The biggest clue is the waistband. If it is exposed, it should feel deliberate, whether through a clean logo, a crisp elastic band, or a proportion that sits just so on the hip. Miu Miu has been building around that exposed-waistband idea for two seasons now, and that styling detail is what keeps the look from collapsing into literal loungewear.

The second clue is structure. A fashion pair holds its shape, even when it is relaxed. It has enough body to skim the leg rather than cling, and enough finish to look like part of an outfit. Sleep shorts, by contrast, usually read softer, slouchier, and a little too obviously bedtime.

A quick styling guide helps separate the two:

• Choose cleaner fabrics over fuzzy ones. Crisp cotton or a polished boxer brief shape reads fashion-first; flannel reads pajama first.
• Keep the waistband visible on purpose. If it is going to show, let it look styled, not slipped.
• Balance the looseness with something sharp on top, like a tailored shirt, a fitted tank, or a boxy jacket.
• Skip novelty prints if the cut is already bold. The silhouette should do the work.
• Finish with shoes that anchor the outfit, not ones that lean further into sleepwear.

What to wear, and what to skip

The best boxer-short outfits have a sense of control. Wear them with a blazer that is clean through the shoulder, a knit that hits at the waist, or a simple tank that lets the shorts carry the idea. The silhouette should feel relaxed but purposeful, like you dressed for heat without surrendering style.

What to skip is anything that makes the look feel accidental. Oversized flannel, frayed hems, sagging elastic, and cartoonish prints push the shorts back into the bedroom. The trend works because it is a little subversive, not because it is sloppy. Once the proportions look thought through, boxer shorts stop feeling like a punchline and start looking like one of the most useful warm-weather shapes in fashion.