Ask any fashion editor or stylist what’s sitting at the heart of their summer wardrobe, and they’ll likely point to a handful of hard-working dresses—versatile, polished, and undeniably cool. And while the world of occasionwear and trend-led pieces can easily nudge you into the higher price brackets, some of the most stylish women on my Instagram feed are turning to a curated selection of under-£500 dresses for summer 2025, that strike the perfect balance between quality and wearability. These aren’t throwaway trend items—they’re elevated staples designed to last.
The beauty of this price-point is that it opens the door to brands that prioritise both design and quality. Think ethically made linen midis from Faithfull the Brand, sculptural silhouettes by St. Agni, or beautifully tailored pieces from Reformation and SIR The Label that you'll turn to for every summer season in the forseeable. That's not to say you can't find a handful of expensive-looking dresses on the high street, but if you're looking for something slightly more luxe, you've come to the right place.
So whether you're building out your capsule wardrobe, shopping with an eye on versatility, or simply looking to invest in something that looks—and feels—expensive, these under-£500 dresses are the pieces fashion people come back to season after season. From day-to-night slips to romantic cotton midis, I've curated a selection of the dresses I can't seem to escape on my Instagram feed. Keep scrolling for the best-selling styles of the summer.
Shop The Best-Selling Summer Dresses for Under £500
With a strapless cut, crinkled cotton‑blend fabric, and a self‑tie back that cinches in just so, St Agni's standout red dress balances structure and ease—for beachside cocktails or weekend weddings alike.
This isn’t your average linen midi—crafted in textured raffia, it’s equal parts cool-girl coastal and Milanese summer holiday. Add cat-eye sunglasses and you’re ready to go.
Blending comfort with polish, this colour-blocking knit midi is best styled with ballet flats or strappy sandals.
Gingham is by far my favourite summer trend, and this DÔEN dress nails it. Featuring a smocking bodice and dainty ties, this is the perfect canvas for straw accessories and sunlit drinks.
One of Reformation's best-selling styles, the Everett dress nails effortless elegance. Pair with a straw bag and Birkenstocks by day, or a clutch and strappy heels by night.
Crisp ivory, micro‑mini length, with a smart button-up—this dress will be the hardest-working style in your summer wardrobe.
Me+Em is responsible for some of my favourite summer dresses, starting strong with this drop-waist smock bodice maxi in a brilliant blue.
A fail-safe white maxi you'll turn to time and time again.
Sculpted yet breathable linen sheath that nips in at the waist and hits just below the knee. Elevated minimalism, perfect for warm-weather office days or rooftop drinks.
The best-selling Quinn dress, loved by Kaia Gerber herself, is forever an editor favourite. The puffed-sleeve makes a case for pared-back dressing—a staple for spontaneous plans when you want to look good without trying.
Channeling vintage charm with a tailored twist, the Lori dress is perfect for day dates and garden parties.
Crafted in a soft blue and even softer fabric, this flowing maxi is made for poolside lounging, barefoot strolls, and holiday evenings that turn into nights.
Clean, crisp, and just a bit nostalgic, the Zebrina offers an effortless upgrade on your usual white dress.
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