How to Find Your Size in Marks & Spencer, Next and Debenhams – Without Guesswork
Author: Stylist and brand team at Tellar
Date: 2025
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How to Find Your Size in Marks & Spencer, Next and Debenhams – Without Guesswork
If you've ever tried shopping online at Marks & Spencer, Next or Debenhams, you’ve probably wondered:
“What size should I order?”
“Is a size 12 in M&S the same as in Next?”
Spoiler: it’s not.
Clothing sizes vary wildly between UK brands—even when the labels say otherwise. That’s why “how to find your size in Marks & Spencer, Next and Debenhams” is one of the top-searched questions among UK shoppers.
🚫 Why Sizing Is So Inconsistent
Even though all three brands are British and use UK sizing, their actual garment measurements differ:
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A UK 14 in M&S often has more generous cuts than in Debenhams
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Next sizes run slim in some lines and oversized in others
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A size Medium in one store could mean a 92cm chest or an 86cm waist elsewhere
With so much confusion, it’s no wonder customers are returning items more than ever.
✅ The Solution: Tellar.co.uk
Tellar.co.uk is the UK’s most advanced clothing size calculator, matching your exact measurements to over 1,500 brands, including:
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✅ Marks & Spencer (M&S)
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✅ Next
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✅ Debenhams
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✅ ASOS, Zara, H&M, Mango, River Island and more
We give you your precise size in each brand using real-time chart comparisons.
🛠️ How to Get Your Perfect Size Match
Option 1: Use Your Body Measurements
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Measure your chest, waist and hips (use our printable tape)
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Get your accurate size in every store instantly
Option 2: Know your size in one brand?
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Just enter that brand and size
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We’ll tell you what that equals in M&S, Next, Debenhams and more
📊 Example Use Case
You wear a UK 12 in M&S — but want to buy a dress from Next.
Tellar will tell you if you need to size up, size down, or stay the same.
You don’t need to compare size charts manually—we’ve done it for you.
🎯 Don’t Guess. Get It Right the First Time
🟢 Download your free measuring tape
📌 Follow Tellar.co.uk for More
We post real examples, fit guides, and size comparison grids every week:
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Pinterest: Tellar.co.uk Pinterest
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Instagram: @Tellar.co.uk
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LinkedIn: Tellar.co.uk LinkedIn
💬 Final Word
Stop second-guessing your size in Marks & Spencer, Next, or Debenhams.
Join the thousands already using Tellar.co.uk to shop smarter, not harder.
✔ No more size chart confusion
✔ No more returns
✔ Always free to use