I Tried On COS's Cult Linen Trousers—They're Elegant, Heatwave-Proof and Selling Out Fast

By Swedan MargenJuly 11, 2026

Linen trousers are one of the summer staples you'll find in every great capsule wardrobe. They're polished yet relaxed, breezy enough for the varying temperatures and will rise to all occasions, whether you're heading to the office or packing up for your summer holidays. In the midst of yet another heatwave, I set about to find a pair of linen trousers that have a high-quality composition, a contemporary feel and a timeless colourway. Naturally, I turned to COS.

Woman wears white tank top, navy barrel leg linen trousers from COS and burgundy ballet flats — Florrie wears the COS Ribbed Cotton Tank Top (£15) and Elasticated Linen Barrel-Leg Trousers (£75)

If refined silhouettes, timeless designs and minimalist colourways feel like descriptors of your wardrobe, then COS is one high street brand that should be firmly on your radar. The brand is a favourite amongst editors and stylish people thanks to its offering of affordable pieces that could easily pass for designer, thanks to the attention to detail shown in composition and form. Over the years, the brand has been responsible for a series of cult buys from the beloved cashmere knits of winter to the highly sought-after summer staples. Now, the Elasticated Linen Barrel-Leg Trousers are set to join the brand's best-sellers list.

The 100% linen composition sets these trousers up to be the perfect antidote to sweltering days. The pared-back design features clean lines and a soft barrel-leg silhouette, which updates these classic trousers for 2026. The elasticated waistband adds to the comfortable ease of these trousers, a necessity in the warmer months. After trying them on, I immediately imagined all the ways these would work hard in my wardrobe, paired with oversized shirts for the office, or thrown on with swimwear when heading from the beach to lunch. As the best COS buys tend to move fast, scroll on to shop the Elasticated Linen Barrel-Leg Trousers, and shop more COS summer staples.