Who What Wear spotlights Reformation, Dôen and Sézane for coastal dresses

The dress edit that actually makes sense for summer 2026

Who What Wear’s summer 2026 dress guide puts Reformation, Dôen and Sézane in the same lane for a reason: all three know how to make a summer dress look effortless without making it look forgettable. The formula is clear and very specific, built around quality fabrics, enduring shapes, pretty details, mini hems, flowing midi lengths, delicate patterns and shades that stay quiet enough to wear hard. That is coastal-grandmother dressing at its sharpest, not as a costume, but as a wardrobe strategy.

What makes this edit work is that these dresses are built for real life, not just a sunny scroll. They are the pieces that move from daytime errands to dinner plans without asking for a costume change, and they all play nicely with sandals, woven bags and the kind of lived-in polish coastal-grandmother style depends on. The difference is in the point of view: Reformation brings sexier polish, Dôen leans into romantic nostalgia, and Sézane gives you Parisian ease with a little more discipline.

Reformation: the sleekest take on coastal polish

Reformation is the brand in this trio that feels most willing to show a little leg, catch a little light and still keep the whole look clean. Its dress shop is built around sustainable long dresses, short dresses and silky dresses, which is exactly why it keeps showing up whenever shoppers want something that reads elevated but not stiff. The shapes are easy to imagine in a beach town closet, but they do not collapse into softness. They have enough line and structure to feel intentional.

The brand also makes sustainability part of the pitch in a way that fits the way a lot of shoppers now think about a summer purchase. Reformation says its forest-based products come from sustainably managed forests, which gives the dress conversation a little more substance than just “pretty and breezy.” If your version of coastal grandmother style is less wicker basket and more polished dinner on the deck, Reformation is the label that hits that sexier, cleaner note.

There is also real momentum behind it. Who What Wear published another Reformation summer-dress roundup today, which says a lot about how hard the brand is still pulling for this category. In a market where a summer dress has to do too much, from lunch to travel to evening, Reformation keeps winning because it understands the value of a silhouette that looks good with flat sandals and still has enough attitude to stand on its own.

Dôen: romantic nostalgia with California in the frame

Dôen is the most sentimental of the three, but not in a cloying way. The brand’s own site describes its collections as thoughtful and timeless, inspired by nostalgia for California of decades past, and that is the exact mood that makes coastal-grandmother style feel warm instead of precious. The pieces tend to feel like they have a memory already, which is why the brand lands so well with shoppers who want romance without fuss.

There is more context here than just the mood board. NET-A-PORTER identifies Dôen as founded by sisters Margaret and Katherine Kleveland in 2016, and retail descriptions connect the label to nostalgic silhouettes and prints rooted in the California coast, along with women-centered production. That history matters because it explains why the dresses feel intimate and lived-in rather than trend-chasing. Dôen is not trying to reinvent summer dressing. It is trying to make it feel inherited.

The business side is moving too. WWD reported in July 2024 that Dôen was entering a new growth stage, expanding wholesale and internationally after a successful Gap collaboration. That matters for shoppers because it signals that the brand’s appeal is not niche anymore. Dôen’s romantic, sun-faded femininity is becoming bigger business, and the market is following the emotional pull of that California softness.

Sézane: Parisian ease with a polished backbone

Sézane is the smartest option if your coastal-grandmother wardrobe needs a little Paris in it. The brand says it is a certified B Corp and a société à mission, and it was founded in 2013 by Morgane Sézalory as the first French fashion brand born online. That origin story is part of the appeal: it feels modern, digitally native and highly edited, but still grounded in the idea that a wardrobe should be built carefully.

Its business model is part of the style story too. Sézane says it prioritizes quality and fair prices, with no overproduction, no sales and no unsold stock. That kind of discipline gives the brand a cleaner, more deliberate feel than labels that chase volume, and it shows up in the clothes. The dresses tend to read polished first, romantic second, which is exactly why they work for anyone who wants coastal-grandmother style to feel slightly sharper and more city-aware.

Marie Claire recently described Sézane’s new arrivals as a shortcut to French vacation style, and that is a useful shorthand here. If Reformation is the most overtly sleek and Dôen is the most nostalgic, Sézane is the one that makes the whole thing look easiest to wear. It is the brand for a summer dress that can sit on a terrace in France one day and survive a humid train ride the next without losing its shape.

How to choose the right coastal-grandmother dress

If the look you want is crisp, modern and a little more seductive, Reformation is the clear lane. Its dresses favor a polished silhouette, lighter fluidity and sustainable talking points that feel relevant rather than preachy.

If you want the dress to feel like it was pulled from a family memory, Dôen is the answer. Its California-rooted nostalgia gives coastal-grandmother style its softest, most romantic expression, the kind that looks best with sun-touched skin and slightly windblown hair.

If you want the most controlled version of the trend, Sézane gives you that French ease with a better wardrobe spine. It is the strongest pick for someone who wants the coastal-grandmother formula to feel a little more tailored, a little more city-bred, and still completely summer-ready.

That is why these three brands keep surfacing in the same conversation. They all understand that the summer dress has to work hard now, and the best ones do not just look pretty in a feed. They carry a point of view, and that is what makes them worth the spend.