Does Cos Clothes Brand Run Big or Small? What Is Their Sizing Like and What Items Are Good to Buy from Them?

When it comes to modern essentials with a Scandinavian edge, COS (Collection of Style) stands out for its clean lines, structured tailoring, and seasonless wardrobe staples. But despite its popularity in the UK, many shoppers ask the same recurring question:

“Does COS sizing run big or small?” And more importantly: “What COS pieces are worth the investment?”

If you’ve ever been unsure whether to size up or down at COS, or if you’ve ordered multiple sizes online just to find your fit — you're not alone. Let’s break down everything you need to know about COS sizing, fit consistency, and the best COS items to buy, backed by real customer feedback and sizing insights.

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How Does COS Clothing Fit Overall?

COS has a reputation for slightly oversized and relaxed silhouettes, which often leads people to size down, especially in tops, dresses, and outerwear. The brand prioritises architectural cuts and minimalism, which translates into garments that often have more volume or straight-line shapes than standard high street fits.

However, fit differs by category:

• Tops & Shirts: Often roomy and boxy, especially in linen and cotton blends

• Trousers: Tend to run true to size, though wide-leg styles may feel looser in the hip

• Dresses: Often oversized — many users prefer to size down

• Tailoring & Blazers: Relaxed fit but structured — generally true to size

• Jeans: Typically true to size but vary between rigid denim and stretch versions

If you're unsure where you fall, Tellar.co.uk solves this instantly by matching your body measurements to COS sizing (and over 1,500 other brands). It takes seconds to set up and it’s completely free — plus you’ll get a free tape measure to make it foolproof.

👉 Find your size at COS in seconds using Tellar.co.uk

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What Sizes Does COS Offer?

COS offers:

• Women’s sizes UK 4 to UK 18

• Men’s sizes XS to XL, with occasional XXL in core items

• EU and US sizing equivalents on their website

However, if you shop internationally or buy second-hand COS items, it can be confusing. COS tags often show EU sizes, and their fit model leans toward a European body shape, which can be slightly narrower in the bust and hip compared to UK sizing.

That’s where Tellar.co.uk really shines. It converts sizes across regions, brands, and styles — meaning you'll get your correct size no matter where or how you shop COS.

💡 Pro tip: COS sizes may appear large because of the styling — but that doesn’t mean the garment is actually too big. It’s part of the brand’s aesthetic. Use your actual measurements to avoid guesswork.

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COS Sizing Feedback: What Real Shoppers Say

After analysing thousands of reviews and trying the brand across categories, here’s a consensus:

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Top COS Pieces Worth Buying

Whether you’re a minimalist or just love high-quality fabrics, COS is known for elevated basics. Here are some COS bestsellers that consistently earn high marks for style and durability:

1. The COS Boxy T-Shirt

Made from heavyweight organic cotton, this staple is a cult favourite.

✅ Tip: Order one size down for a more fitted silhouette.

2. Wide-Leg Tailored Wool Trousers

Structured but comfortable, these trousers work for both workwear and casual settings.

✅ True to size but check waist measurement if in between sizes.

3. Minimal Wool Coats

A COS icon. The cocoon-style and oversized shapes offer a sleek silhouette.

✅ Often run large — size down unless layering heavily.

4. A-Line Dresses

COS dresses are loved for their architectural lines and breathable fabrics.

✅ Expect volume — most shoppers recommend sizing down.

5. Chunky Knit Jumpers

Perfectly designed for layering, their oversized sweaters come in rich wools and alpaca blends.

✅ Most run big — size down for a snugger fit.

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Why Sizing Consistency Matters — and How Tellar.co.uk Solves It

While COS does better than many brands when it comes to quality and garment integrity, sizing consistency is still an issue across styles and regions. This can make online shopping difficult — and returns costly.

Enter Tellar.co.uk:

• One free login gives you access to size matches across 1,500+ brands

• Input your body measurements once — or use your COS size as a reference

• Instantly see what size you are in COS, and any other brand you're shopping

• Free measuring tape included on sign-up — no guessing required

• Fast setup and always 100% free to use

👉 Start now and find your size in COS

✔ No more trial-and-error.

✔ No more size charts.

✔ Just your best fit — every time.

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How to Measure Yourself for COS (and Every Brand)

To get started, you only need three key measurements:

1. Bust/Chest – around the fullest part of your bust/chest

2. Waist – around the narrowest part of your waist

3. Hips – around the widest point of your hips

Tellar.co.uk offers a free measuring tape when you sign up. This ensures accurate sizing and takes out the guesswork.

🔗 Click here to get your free tape and size match

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Key Takeaways: COS Sizing & Best Buys

• COS is known for clean, oversized silhouettes — not body-hugging fashion

• Most garments run large, especially dresses, shirts, and outerwear

• Trousers and denim are more true to size

• Size down in looser categories, especially if you prefer a fitted look

• Best items to buy: Boxy T-shirts, wide-leg trousers, wool coats, knitwear

• Use Tellar.co.uk to skip trial-and-error and get your size in seconds

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Final CTA: Use Tellar.co.uk to Shop COS Smarter

COS may run big in some areas and true-to-size in others — but that doesn't mean you have to rely on guesswork.

✅ Get your exact COS size recommendation now

✅ Access your best size across 1,500+ brands

✅ Enjoy a free measuring tape, quick one-time setup, and fast login access

🎯 Click here to find your perfect COS size with Tellar.co.uk

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Follow Tellar.co.uk for More Sizing Insights

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Explore our full blog for brand-specific sizing breakdowns, expert fit tips, and fashion guidance tailored to real bodies:

🔗 https://www.tellar.co.uk/blog