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With temperatures set to hit 30 degrees in the coming days, chances are you’ve already started rifling through your wardrobe in search of last summer’s dresses—only to realise they’re not quite delivering the same impact. Which is exactly how my pre-payday search for a chic, expensive-looking update (that doesn’t require a designer budget) began.
As ever, I started with COS. The minimalist in me is always drawn to its clean lines, considered cuts and those subtle design details that make even the simplest silhouette feel elevated. For something a little more trend-aware, I inevitably turn to Zara and H&M—think lace trims, polka dots and the now-inescapable basque waist, all reworked in a way that still feels wearable.
For those leaning towards something softer and more romantic, Marks & Spencer continues to impress. Its offering of floaty, pretty dresses, complete with puff sleeves, delicate florals and flattering silhouettes, has quietly become one of the strongest on the high street. And if you’re willing to invest a little more, Reformation and Anthropologie consistently deliver on easy, whimsy dresses that feel just that bit more elevated, perfect for everything from city days to holidays and last-minute summer plans.
Keep scrolling to shop a tightly edited selection of dresses that make heatwave dressing feel effortless, and look far more expensive than they actually are.
Shop The Best Expensive-Looking Summer Dresses
COS
Sculpted Dropped-Waist Midi Dress
From the dropped waist to the square-neck design, this COS dress feels far more expensive than it is.
ZARA
Zw Collection 100% Linen Midi Dress
Proof that a simple, minimal dress is sometimes best.
Reformation
Cecilia Linen Dress
The Cecilia is the kind of dress that works for both everyday and occasions.
M&S
Pure Cotton Shirred Midi Waisted Dress
Comfort meets polish. The shirred waist keeps it flattering while still feeling relaxed.
ZARA
Polka Dot Midi Dress With Bow
The ruching and dropped waist design make this an automatic compliment machine.
COS
Ruched Dropped-Waist Poplin Midi Dress
Effortless evening dressing, solved.
H&M
Flared-Skirt Low-Back Dress
Throw on, add sandals and go.
ZARA
Zw Collection Lace Dress
The lace details make this feel so elevated.
ALIGNE
Darcy A-Line Mini Dress
A very polished take on the little black dress.
Free People
Forever Free Maxi Dress
A true throw-on piece that still makes an impact.
COS
Linen Mini Shift Dress
Clean, simple and exactly what you want in a heatwave
H&M
Cotton Halterneck Dress
M&S
Satin Lace Insert Mini Skater Dress
A softer, more romantic take on occasion dressing
Damson Madder
Juno Midi Dress With Sheer Scarf- Navy
The perfect wedding guest dress, the deep navy hue and scarf-detail makes this look so expensive.
Abercrombie
100% Cotton Bra-Free Dylan Midi Dress
Butter yellow is back, and this bra-free Abercrombie dress is the perfect summer staple.
COS
Tiered Gathered Midi Dress
Floaty without feeling overwhelming, and ideal for those throw-on summer moments.
Damson Madder
Campbell Midi Dress – White
The soft white cotton and floaty silhouette make this feel perfect for hot city days or holidays alike.
COS
Tailored Linen Mini Dress
A sharper take on summer dressing.
ALIGNE
Adeline Satin Maxi Dress
The bias cut gives it that fluid, barely-there movement that always looks expensive.
H&M
Flared-Skirt Halterneck Dress
White dresses will never not be chic. Pair with ballet flats and a beaded bag for the perfect summer evening look.
Abercrombie
Bra-Free Cap Sleeve Dipped Waist Midi Dress
A subtle update on a classic shape. The dipped waist adds interest while still keeping it timeless.
So pretty, this is the kind of dress that works just as well in the city as it does on holiday.
Free People
Dahlia Embroidered Maxi Dress
Rich in detail and full of personality, this feels like a vintage find you’ll keep forever.
ZARA
Striped Midi Dress With Bows
A playful take on summer dressing, this is perfect for holidays abroad.
MANGO
A-Line Dress With Godets
ALIGNE
Tracy Sheer Midi Dress
Light, airy and incredibly fashion-person coded, this is the person office outfit.
Reformation
Sara Linen Dress
Simple, clean and quietly chic.
Damson Madder
Elina Midi Dress – Choc Taffeta
So Damson Madder coded, there’s something very cool about the taffeta finish.
MANGO
Boat-Neck Ruched Dress
A statement dress that’s still incredibly timeless and wearable.
ZARA
Asymmetric Camisole Dress
The asymmetric neckline and lace detail gives this otherwise simple dress a more fashion-forward edge.
Free People
To the Moon Maxi Dress
Floaty, carefree and made for warm evenings.
M&S
Satin V-Neck Lace Insert Midi Slip Dress
This looks so much more expensive than it is.
Abercrombie
Emerson Puff Sleeve Midi Dress
A best-seller for a reason, I love the sweet puff-sleeve details.
M&S
Broderie Cutwork Detail Mini Shift Dress
Sweet but still polished. The broderie detailing gives it that expensive, summer-ready feel.
ZARA
Linen Blend Midi Dress With Belt
An easy, pulled-together option. The belt does the styling for you, making it perfect for busy days.
ZARA
Midi Linen Blend Dress With Tucks
Heatwave dressing at its easiest.
H&M
Linen-Blend Strappy Dress
An easy summer find you’ll wear on repeat.
Reformation
Birdie Linen Dress
Powder blue is my favourite summer trend of 2026.
MANGO
A-Line Linen Dress – Women | Mango United Kingdom
A warm-weather staple you’ll never regret.
