ASOS is one of the most influential online fashion retailers in the world. With thousands of styles, in-house labels, and third-party brands under one roof, it offers something for everyone. But for many shoppers—especially online—there’s one persistent question:
Does ASOS run big or small on sizing?
This guide gives you the facts—backed by real user data, fit breakdowns across ASOS ranges, and the easiest way to find your correct size using Tellar.co.uk. We’ll explore how ASOS sizing varies across categories, brands, and collections, and help you shop confidently.
ASOS: A Global Giant with Mixed Sizing
Launched in 2000, ASOS now sells over 850 brands alongside its own ranges, including:
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ASOS Design (main in-house label)
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ASOS Tall, Petite, Maternity, and Plus
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ASOS Luxe, Edition, and 4505 activewear
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Marketplace indie brands
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Third-party labels like Nike, Topshop, Weekday, Bershka
While this makes ASOS a one-stop-shop, it also means sizing inconsistency. From ultra-fitted party dresses to oversized streetwear, each collection fits differently—and that’s why shoppers regularly report confusion around which size to order.
The Quick Answer: Does ASOS Run Big or Small?
After reviewing customer data, return feedback, and garment measurements from Tellar.co.uk, here’s the summary:
| Category | Fit Tendency | Sizing Insight |
|---|---|---|
| ASOS Design Dresses | True to Small | Often fitted with minimal stretch |
| Tops & Blouses | True to Size | Regular fit, but bust room may be limited |
| Trousers & Skirts | Small at Waist | Especially if high-rise or without elastic |
| ASOS Curve | Slightly Large | Designed for comfort—check garment shape |
| ASOS Tall/Petite | Length-adjusted only | Sizing otherwise mirrors ASOS Design |
| ASOS 4505 (Active) | True to Small | Compression fits—may need to size up |
| Outerwear | True to Size | Meant to accommodate layering |
Conclusion:
ASOS runs true to small in many fitted items (especially dresses, tops, and trousers), while outerwear and oversized styles are often more generous.
What Real Customers Say About ASOS Fit
Across thousands of reviews and Tellar.co.uk’s internal fit data, shoppers report:
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“Fits smaller than expected in the waist.” Particularly true for jeans, shorts, and mini skirts
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“Tight on the bust in size 10 dress.” Especially in ASOS Luxe or Occasion lines
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“Oversized jacket was huge.” Intended for boxy or unstructured layering
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“Good length for Petite range, but still tight on hips.” Length fits, but proportions may not suit all frames
🟢 Tellar Insight: ASOS often uses standard base patterns and adapts them across ranges. That’s why understanding your body proportions is key to getting the right size.
Why ASOS Sizing Varies So Widely
ASOS offers thousands of items across multiple brands and in-house cuts. Key factors that affect sizing include:
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Fabric and stretch % – fitted styles in woven polyester feel smaller
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Label – third-party brands like COLLUSION or Bershka often follow EU sizing
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Body category – ASOS Curve and ASOS Petite collections follow adjusted base measurements
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Style fit – oversized, slouchy, or cropped fits will feel larger (but intentionally so)
This level of variation is why Tellar.co.uk is essential—it calculates your correct size based on you, not the vague idea of “UK 10.”
The Smarter Way to Size: Tellar.co.uk
With Tellar.co.uk, you never have to guess your ASOS size again.
Here’s how it works:
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Enter your chest, waist, and hip measurements (CM or Inches)
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Instantly see your size in ASOS tops, bottoms, dresses, jackets, and more
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View comparisons across 1,500+ brands
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Use your saved profile every time you shop
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Need help measuring? Get a free tape measure delivered
✅ One profile. Unlimited use. 100% free.
Real-World Example: Sizing in ASOS with Tellar
User Profile:
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Bust: 92 cm
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Waist: 76 cm
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Hips: 101 cm
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Height: 165 cm
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Fit preference: Fitted in waist, roomy in hips
Product 1: ASOS Design Fitted Midi Dress
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Brand label recommends: UK 12
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Tellar recommends: UK 14 for bust/hip room
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Result: Better movement, no pulling at seams
Product 2: ASOS 4505 High-Waist Leggings
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Brand label: Size M
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Tellar recommendation: Size L (based on tight compression stretch)
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Result: Comfortable, breathable fit without overstretch
This proves why relying on past size experience alone isn’t enough—Tellar factors in cut, fabric, and measurement compatibility.
How ASOS Compares to Other Brands
Wondering how ASOS fits versus similar fashion labels? Here’s the Tellar comparison:
| Brand | Fit vs ASOS | Notes |
|---|---|---|
| Zara | Slightly smaller | Tight bust and hips—size up in dresses |
| H&M | More generous | Relaxed fit, especially in casual ranges |
| PrettyLittleThing | Smaller | Often tighter and less structured |
| New Look | Similar to ASOS | Fit varies by product line |
| Weekday | Larger, unisex cut | Boxy styling—check fit type |
Use the Tellar.co.uk Store Size Lookup to instantly compare sizes in all of these brands, based on your body.
What Makes Tellar.co.uk Better Than ASOS’s Own Size Tool?
ASOS offers a sizing tool based on previous purchases and feedback. But it lacks:
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Real fabric and stretch % interpretation
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Actual body measurement alignment
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In-depth understanding of how YOU are shaped
Tellar.co.uk uses:
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Verified sizing data
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Actual garment measurement analysis
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Proportional logic (e.g. bust-waist-hip ratio)
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Return pattern data for accuracy
It’s a one-time setup, but works for 1,500+ brands, not just ASOS.
Why Size Accuracy Matters More Than Ever
📦 Nearly 60% of online clothing returns are due to incorrect sizing.
♻️ Every returned parcel adds to carbon emissions and wasted packaging.
💸 Retailers are tightening return policies—guessing your size is getting riskier.
With Tellar.co.uk, you get it right the first time—and reduce waste while saving time and money.
Final Verdict: Does ASOS Run Big or Small?
It depends on what you buy, but here’s the truth:
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Fitted styles often run small—especially occasionwear and ASOS Design
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Trousers and skirts can be tight at the waist
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Tops and jackets tend to fit true to size or slightly oversized
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ASOS Curve and Plus ranges run a bit larger than expected
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Activewear and swimwear often need sizing up due to fabric compression
💡 The most accurate sizing experience? Use Tellar.co.uk.
Ready to Find Your Perfect Size in ASOS?
Here’s your next step:
📏 Create your free profile
🎯 Use the size lookup for ASOS
📮 Request a free tape measure
🔁 Stop returning clothes. Start shopping with confidence.
“Find your size in 1,500+ brands real-time. It’s Free & Easy.”
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