In a market saturated with luxury brands, COS stands out as one of the few non-designer labels to consistently produce viral, covetable pieces each season. The brand’s appeal lies in its clean aesthetic, high-quality offerings, midrange pricing, and remarkable versatility—successfully positioning it to attract both minimalist and trend-aware shoppers.
This influence was officially recognized in 2025 by the Lyst Index, which not only ranked COS alongside renowned labels such as Miu Miu, Loewe, and The Row but also named one of its cashmere sweaters among the Hottest Products. To maintain its standing in an increasingly competitive fashion landscape, COS continues to deliver standout pieces that fashion insiders are quick to purchase. Even in the first two weeks of 2026, the brand has already produced best sellers. They’re recognizable items that might not be explicitly branded or tagged as COS on Instagram but are instantly identifiable to those in the know.
To get the inside scoop on what the fashion set is already buying and recommending, keep scrolling. Ahead, discover 13 must-have pieces, ranging from everyday sweaters and dark-wash jeans to fresh wool coats and high-vamp heels.
The 13 Best-Selling COS Buys of 2026 So Far
1. Boiled Merino Wool Zip-Up Sweater
COS
Boiled Merino Wool Zip-Up Sweater
It seems like sporty yet chic dressers everywhere are wearing fleeces with leggings and tailored pants. This elevated version hits on the sporty-retro vibe while remaining modern and tasteful thanks to the luxe boiled merino wool, mock neck, and neutral hue. Note that this piece also comes in a gorgeous chocolate brown.
2. Clean Cut T-Shirt
This new classic T-shirt is the ultimate wardrobe staple, serving as the grounding element that ties everything together. It’s made from an organic cotton jersey fabric that gives it a weighty feel, yet it retains a clean fit and a long enough hem to be tucked into mid-rise trousers or left hanging out.
3. Chunky Cashmere Mock-Neck Sweater
COS
Chunky Cashmere Mock-Neck Sweater
I’m predicting that COS has another viral hit on its hands with this mock-neck knit, following the immense popularity of its Chunky Pure Cashmere Crew-Neck Sweater, which even made the Lyst Index last year. This new version, which is already sold out in ivory, shares the same material, weight, and ribbed hem as the original crewneck. The key difference is the chunky ribbed high neck, which elegantly frames the face. For the most stylish finish, try tucking your hair into the neck to achieve the coveted Olsen tuck.
4. Pleated Wool-Blend Tulip Pants
COS
Pleated Wool-Blend Tulip Pants
While trouser silhouettes may be narrowing in 2026, the baggy fit remains a perennially cool choice. This particular style, a new addition to COS’s winter collection, features a loose cut that gently tapers to the ankle. Details include three pleats, a single back pocket, and a concealed hook-and-eye closure. Choose between the navy and the black, and style it with a fitted blazer, sheer tights, and heeled sandals.
5. Cashmere Triangle Scarf
COS
Cashmere Triangle Scarf
While blanket scarves are cozy and charming, a cashmere triangle scarf—particularly one in a vibrant color—offers a sleeker, more refined look, especially when layered over an oversize jacket or coat. Though several brands offer this style, the version from COS has proven the most sought-after, selling out every time it’s been replenished. Don’t miss this opportunity to grab it now that it’s back in stock.
6. Merino Wool Crew-Neck Sweater
COS
Merino Wool Crew-Neck Sweater
At first glance, this sweater appears simple, but upon a closer look, it boasts several sophisticated details. Notable features include double-knitted shoulders for added dimension without bulk and a raw rolled hem that contributes to its relaxed aesthetic. Plus, it is crafted from soft merino wool, ensuring a lightweight layer that drapes nicely.
7. Sculpted Double-Faced Wool Short Coat
COS
Sculpted Double-Faced Wool Short Coat
Remember that stunning navy coat from COS’s F/W 25 runway? It has finally launched in navy and brown and is already selling out. Fashion insiders are drawn to its unique silhouette, which includes a subtly fitted waist for shape and an oversize collar that offers an organic touch whether styled open or closed.
8. Dial Wide-Leg Jeans
The Dial Jeans are a favorite for their wide-leg silhouette and organic raw denim that gives it a rigid look. While these pants were first released in light beige and black, they now come in a dark-blue wash, catering to those who have or want to invest in the hottest denim color trend for 2026.
9. Rounded Double-Faced Wool Jacket
COS
Rounded Double-Faced Wool Jacket
A wool jacket is a key piece for transitioning between seasons, easily adapting from winter to spring through layering. Selecting the perfect one is crucial, as it offers significant versatility and wear. This COS style is a smart investment that features fabric-covered buttons and a nearly collarless design. For a chic look, wear it over a white button-down with an interesting neckline, then complete the outfit with baggy trousers and loafers.
10. Merino Wool-Yak Zip-Up Polo Shirt
COS
Merino Wool-Yak Zip-Up Polo Shirt
When it comes to wardrobe basics, I always recommend polo shirts. Specifically, I suggest opting for half-zip polo tops over traditional button-downs. The half-zip style feels more modern and less preppy, which is great if that’s not your usual aesthetic. I particularly like layering them under crewneck sweatshirts and pairing them with baggy trousers and sleek sneakers.
11. Tailored Straight-Leg Pants
COS
Tailored Straight-Leg Pants
If I were in the market for a new pair of pants, these would be the ones. The high waist and straight leg make them an instant staple. It goes without saying that they pair well with all types of tops and outerwear, but they also work with all shoes, which is hard to find in a pair of pants.
12. Square-Toe Leather Heeled Shoes
COS
Square-Toe Leather Heeled Shoes
High-vamp heeled pumps that cover the middle of the upper foot have been a major trend for the past five months. However, as we transition into winter, I anticipate a shift toward high-vamp heels that come up a bit higher, hitting just below the ankle. This style is inherently elegant, whether paired with a midi skirt to reveal a sliver of ankle or worn with jeans, allowing only the shoe’s toe to peek out.
13. Knoll Shoulder Bag
Don’t sleep on COS’s handbags. Just like its knits, pants, and outerwear, the brand makes amazing bags that fashion insiders covet every season. In the fall, it was the Mini Studio and Marais Bowler Bags. This winter, it’s shaping up to be the Knoll Shoulder Bag, which has a very relaxed vibe thanks to its slouchy suede fabric and long strap. Stuff your essentials in it, then sling it over your shoulder whether you’re heading to Pilates or the office.