How to Order the Right Clothes Size Online

Your guide to getting it right—first time, every time

Why Online Sizing Is So Often Wrong

Ordering clothes online should be simple, but millions of people end up with the wrong size. The problem? There’s no standard sizing across brands, vanity sizing is common, and regional systems (UK, EU, US) don’t align. Add in confusing fit types—slim, relaxed, oversized—and it’s no wonder returns are so frequent.

That’s exactly what tellar.co.uk was built to solve.

The Truth About Size Charts

Every clothing brand creates their own size chart, and they can differ wildly. For example:

A UK 12 at one store may measure the same as a 10 or 14 elsewhere
Some brands use vanity sizing to make garments appear more flattering
Men’s and women’s sizing follow different logic altogether
International conversions (e.g. EU 38 vs UK 10) are not reliable

If you’re shopping online and not using your exact body measurements, you’re guessing.

Step 1: Measure Yourself Properly

To start, you’ll need three key measurements:

Chest: Around the fullest part
Waist: Around your natural waist (not where your jeans sit)
Hips: Around the widest part of your hips and bottom

You can use a soft measuring tape—or if you don’t have one, download the free printable tape from Tellar.co.uk here:

👉 tellar.co.uk

You only need to do this once. Tellar stores your measurements securely, so next time, you just log in and check your size instantly.

Step 2: Use Tellar to Match Your Size in 1,500+ Brands

Once your measurements are saved, Tellar does all the work:

Choose any store or brand you want to shop
Tellar compares your body to that brand’s official size chart
You instantly see your best-matching size
It works in real-time—before you buy

You’ll also see a note if the brand runs small or large, based on Tellar's data.

Tellar currently supports over 1,500 brands including Zara, M&S, H&M, Reiss, Mango, ASOS, Massimo Dutti, White Stuff, and more.

Explore the full store list at:

👉 tellar.co.uk

Step 3: No Tape Measure? Use a Known Size Instead

Don’t have a tape measure to hand? You can still use Tellar.

Just enter a brand and size you already wear
Tellar will estimate your measurements behind the scenes
Then, you’ll get accurate size recommendations across every other store

Try it now:

👉 Use a known brand size to set up your profile

You’ll be able to edit and update your size profile at any time.

Step 4: One-Time Setup. Real-Time Results. Free Forever.

Here’s what makes Tellar.co.uk different:

Free forever – no hidden costs or subscriptions
One-time setup – enter your data once and reuse it anytime
Real-time matching – get instant results before buying
1,500+ stores and brands covered
Works on both mobile and desktop, with an app coming soon
Privacy-first – your data is never shared with brands

This isn’t just a size converter. It’s a personal body-matching tool built for how we actually shop.

Step 5: Check Before You Buy—Every Time

Tellar is quick enough to use while browsing:

Visiting a store site? Open tellar.co.uk and search that brand
Enter your measurements or click your saved profile
Instantly check your correct size in that specific brand

No more guesswork. No more sizing charts. Just the right size—first time.

Ready to Stop Guessing?

Join thousands of people already using Tellar.co.uk to shop smarter.

Create your free profile in under a minute
Check your size in 1,500+ stores
Learn how Tellar works
Use our free printable measuring tape
Contact the team if you have questions

Tellar.co.uk – Find your size in 1,500+ brands real-time. It’s Free & Easy.

Follow Tellar.co.uk

For size comparisons, brand deep dives, and helpful tips:

Instagram: @Tellarsizing
Pinterest: TellarUK
Facebook: TellarSizing
Twitter (X): @TellarSizing
LinkedIn: Tellar on LinkedIn