What to Wear in a Heatwave: How to Stay Cool in Summer 2026
When the temperature spikes, the last thing you want is to be stuck in the wrong outfit. Staying cool is about choosing the right shapes and fabrics — not just wearing as little as possible. Here's what to wear in a heatwave, whether you're at a festival, a day-party or just trying to survive the commute.
The rules for dressing in hot weather
Three things keep you cool: breathable fabrics that let air move, loose or floaty shapes that don't cling, and lighter colours that reflect rather than absorb heat. Get those right and you'll be comfortable all day — the specific pieces below all follow those rules.
The coolest pieces for a heatwave
1. Floaty co-ords
A lightweight co-ord is the ideal heatwave outfit — breathable, easy, and a complete look in one. Skirt-and-top or short sets in floaty fabrics keep you cool while looking put-together.
Shop: co-ords.
2. Mini dresses in light fabrics
A loose mini dress is the definition of throw-on-and-go in summer. Look for floaty, non-clingy shapes that let the air move — perfect for day-parties and warm evenings alike.
Shop: mini dresses and summer dresses.
3. Playsuits
Shop: playsuits.
4. Skirts with a light top
A mini or midi skirt with a breathable cropped or loose top lets you keep cool up top and down below. Easy to dress up or down depending on your shoes.
Shop: skirts.
What to wear to a festival in a heatwave
Festivals plus heat need extra thought: pick breathable, loose pieces you can dance in for hours, wear light colours, and always pack something for when the sun drops. A floaty co-ord or a light mini with sturdy footwear and sunglasses is the sweet spot.
For the full festival breakdown, see our festival outfit guide.
Shop: festival co-ords.
Fabrics that keep you cool (and ones to avoid)
Lighter, breathable fabrics move air and dry quickly, which is exactly what you want when it's hot. Loose weaves and floaty finishes beat anything tight and heavy. As a rule of thumb, if a piece clings and traps heat, it'll feel worse as the day goes on — so prioritise shapes that skim rather than grip.
Heatwave outfit FAQs
What should I wear in a heatwave? Choose breathable fabrics, loose or floaty shapes, and lighter colours that reflect heat. Floaty co-ords, loose mini dresses, playsuits and light skirts with breathable tops are all ideal for staying cool on hot days.
How do I stay cool in summer clothes? Pick pieces that skim rather than cling, in breathable fabrics and lighter colours. Loose shapes let air move around you, which keeps you far cooler than tight clothing that traps heat.
What should I wear to a festival in hot weather? Wear breathable, loose pieces you can dance in for hours, in light colours, with sturdy footwear and sunglasses — and pack a layer for when the temperature drops in the evening. A floaty co-ord or light mini dress is a great choice.
What fabrics are best for hot weather? Lightweight, breathable fabrics with a loose weave are best because they let air move and dry quickly. Avoid heavy, tight materials that cling and trap heat, as they get more uncomfortable as the day goes on.
Beat the heat in style — shop co-ords, summer dresses and playsuits at Rebellious Fashion, with UK next day delivery.