Brand Size Comparison: How to Shop Smarter Across Different Clothing Labels

Online shopping offers incredible convenience — but the biggest downside is clear: inconsistent sizing across brands. You could be a size 8 in Zara, a size 10 in H&M, and a size 12 in COS — all on the same day.

That’s where brand size comparison becomes essential.

Instead of guessing, returning, or buying multiple sizes “just in case,” shoppers are turning to smart tools like Tellar.co.uk — a free online platform that instantly compares your size across 1,500+ fashion brands.

Why Brand Size Comparison Is So Important

Clothing brands all follow their own sizing logic. Some use vanity sizing, others cut their garments small for a slim-fit aesthetic. Even between collections within a brand, sizing can shift.

Here’s what varies across brands:

How garments are cut (tailored, relaxed, oversized)
Vanity sizing (inflated sizes to make you feel smaller)
Regional sizing standards (UK vs US vs EU)
Garment type (e.g. denim sizes vs dresses vs tops)

Without a consistent standard, it’s almost impossible to shop confidently across brands — unless you use a brand size comparison tool like Tellar.

What Is Tellar?

Tellar.co.uk is a free online sizing tool that helps you find your perfect fit across more than 1,500 clothing brands.

You simply enter:

Your body measurements (chest, waist, hips), or
A brand and size that already fits you well

Then, Tellar instantly shows you what size to buy in any other brand — based on real brand data, not guesses.

How Brand Size Comparison Works on Tellar

Let’s say you wear a size 10 in ASOS jeans, and you want to buy trousers from Reiss.

Instead of hoping the fit is the same:

You go to /store-size-lookup
Select “I know my size in a store”
Enter ASOS, size 10
Select Reiss from the next dropdown

✅ Tellar instantly shows your best-fitting size in Reiss — and even tells you whether the brand typically runs small or large.

What Makes Tellar’s Brand Comparison Different?

Feature	Traditional Method	Tellar
Based on body measurements	❌	✅
Works across 1,500+ brands	❌	✅
Adjusts for sizing quirks (runs small/large)	❌	✅
Free & browser-based	❌ (apps or subscriptions)	✅
Real-time recommendations	❌	✅

Tellar’s power is in its real brand data. It doesn’t just show you a generic size chart — it actually compares how brands interpret sizing differently, and tells you what to wear.

Use Case: Brand-to-Brand Size Matching

Scenario: You wear a size M in Uniqlo T-shirts but want to try something from Mango.

With Tellar’s brand size comparison:

You enter “Uniqlo - M”
Select “Mango” as your new brand
Tellar shows that your equivalent Mango size is likely a L, based on fit and cut differences

No guessing. No over-ordering. Just a clear, personalised recommendation.

Benefits of Brand Size Comparison

✅ Buy the Right Size the First Time

Say goodbye to the back-and-forth of returns and refunds.

✅ Shop Across More Brands

Confidently buy from new or unfamiliar labels without worrying about sizing surprises.

✅ Save Time and Money

No more ordering duplicates “just in case.” One order, one fit, done.

✅ Reduce Returns & Environmental Waste

Returns create carbon emissions and cost retailers — better sizing helps everyone.

Who Can Benefit from This?

Frequent online shoppers
Gift buyers trying to find the right size for someone else
People with changing body sizes (e.g. pregnancy, fitness, medical changes)
Men and women shopping across multiple stores
Teens and students exploring different fashion brands

Brands You Can Compare on Tellar

With over 1,500 brands supported, you can compare sizing across:

🛍️ High street: H&M, Zara, ASOS, River Island

👗 Premium: Reiss, COS, AllSaints, Whistles

👖 Denim: Levi’s, Weekday, Wrangler

🎽 Activewear: Nike, Adidas, Gymshark

… and many more.

How to Use Tellar for Brand Size Comparison

Head to https://tellar.co.uk
Choose your input type:
- "I have my measurements" OR
- "I know my size in a store"
Enter the original brand and size (e.g. H&M, size 12)
Enter the new brand (e.g. & Other Stories)
See your best size in the new brand instantly

Coming Soon: Real-Time Comparison While You Shop

Tellar is currently developing a Chrome extension that will:

Automatically show your best size while browsing brand websites
Save your sizing profile for one-click recommendations
Offer brand fit notes (e.g. "this item fits oversized")

Stay tuned — size matching is about to get even more seamless.

Final Thoughts

If you shop across multiple fashion brands, a brand size comparison tool is no longer a luxury — it’s a necessity.

Tellar.co.uk is the UK’s best free solution for finding your size across 1,500+ stores, instantly and accurately.

Say goodbye to confusing charts and sizing surprises — and hello to a smarter, faster, and more confident shopping experience.