What’s My Clothes Size at Uniqlo? Does Uniqlo Run Big or Small?

Uniqlo is known for its minimalist design, exceptional fabric technology, and affordability. With a global reputation for wardrobe staples—from HEATTECH thermals to Ultra Light Down jackets—Uniqlo has become a go-to for people seeking everyday basics that actually perform.

But despite its widespread popularity, one sizing question comes up repeatedly:

Does Uniqlo run big or small?

And how can you make sure you're ordering the right size, especially as a UK shopper dealing with Asian sizing roots and global fit variations?

In this guide, we’ll explain how Uniqlo sizing really works across different categories—and introduce Tellar.co.uk, the UK’s most accurate free sizing tool that matches your exact body shape to your correct Uniqlo size in real time.

Does Uniqlo Run Big or Small?

Uniqlo tends to run small in fitted styles, and true to size in relaxed styles. However, the fit can vary significantly depending on:

Gendered fit blocks (Asian vs. Western)
Product category (e.g. trousers vs. outerwear)
Region (UK sizing vs. Uniqlo US or Asia)

For UK women:

Tops (e.g. tees, knits, thermals): True to size or slightly small if fitted
Dresses: Often small in the bust or shoulder area
Trousers and jeans: Can run small at the waist or hips, especially if you're curvy
Outerwear: True to size or slightly roomy for layering

If you have a fuller bust, wide hips, or broad shoulders, you may need to size up, especially in structured or woven items.

Why Uniqlo Sizing Feels Confusing

1. Asian Fit Origins

Uniqlo is a Japanese brand, and many garments—especially those manufactured for a global audience—retain a fit designed for slimmer, narrower body frames. This means:

Narrower shoulders
Smaller bust allowance
Shorter torso and sleeve lengths

2. Minimal Stretch in Some Basics

Popular Uniqlo fabrics like:

Cotton poplin
Rayon blends
Linen
have very little stretch, so fitted pieces can feel snug.

3. Standardised Cuts

Uniqlo designs around uniform, scalable sizing to simplify global production. While this ensures consistency, it doesn’t account well for body shape diversity.

Fit Overview by Garment Type

Garment Type	Fit Pattern	Tellar Sizing Tip
Supima cotton tees	Slim and short	Size up if long-torsoed or busty
HEATTECH thermals	Body-hugging	True to size or up for comfort
Wide-leg trousers	Mid-rise, rigid waist	Size up if curvier through hips
Knitwear	Straight cut	True to size or down if petite
Linen shirts	Slim at shoulder	Size up if broad-shouldered
Down jackets	Designed for layering	True to size

Uniqlo Size Chart (Women’s – UK Conversion)

Size	Bust (cm)	Waist (cm)	Hips (cm)
XS	77–83	61–66	85–90
S	80–86	64–70	88–94
M	83–89	67–73	91–97
L	86–92	70–76	94–100
XL	89–95	73–79	97–103

Uniqlo uses combined size brackets rather than strict single-number UK sizes. This can cause confusion—especially if you fall between categories.

The Problem with General Size Charts

Uniqlo’s fit chart doesn’t tell you:

Which item is slim-cut, oversized, or boxy
Whether the fabric has stretch
How your unique body shape (e.g. petite, athletic, pear-shaped) interacts with the garment cut

That’s why UK shoppers often order two sizes—or end up returning what doesn’t work.

Tellar.co.uk: The Smarter Way to Shop Uniqlo

Tellar.co.uk is the UK’s most advanced free sizing tool. It matches your real body measurements to Uniqlo’s actual garment logic—based on:

Cut
Fabric
Fit category
Your unique proportions

No more relying on guesses, charts, or reviews.

How It Works

Go to www.Tellar.co.uk
Create a free profile in under a minute
Enter your bust, waist and hips in cm or inches
Select Uniqlo from the brand list
Instantly get your size across tees, outerwear, jeans, dresses and more

Once set up, Tellar will work seamlessly across 1,500+ brands.

Why It Works So Well for Uniqlo

✅ Adapts to Cut

Boxy tee? Slim trousers? Tellar adjusts your size accordingly.

✅ Understands Fabric

Tellar knows when Uniqlo’s cotton is rigid or when HEATTECH stretches—and it adjusts your size accordingly.

✅ Shape-Sensitive

Your shape—not just one measurement—determines the result.

✅ One-Time Setup

Enter your details once, and never worry about Uniqlo sizing again.

✅ Free Forever

No subscriptions, no upgrades—just instant, accurate sizing.

Example: UK Size 12 Shopper

Measurements:

Bust: 91cm
Waist: 74cm
Hips: 101cm

Tellar might recommend:

Uniqlo Supima tee: Size L (due to narrow bust and torso length)
Uniqlo high-rise jeans: Size L (for hip room)
Uniqlo down jacket: Size M (roomy fit, layering allowance)
Uniqlo HEATTECH top: Size M (stretchy, designed to hug)

Each recommendation includes a short explanation—so you know exactly why it fits you.

Not Just for Uniqlo

Once your profile is saved, Tellar also gives you instant sizing for:

COS
Massimo Dutti
Mango
Zara
Free People
Reiss
Sézane
Whistles
…and over 1,500 more brands

Final Thoughts

Uniqlo sizing varies by category and fabric. While many garments run true to size, slim-fitting pieces and rigid trousers may require sizing up—especially if you’re fuller-figured, tall, or in between standard categories.

Tellar.co.uk eliminates the guesswork. With real-time, data-backed sizing that accounts for cut and body shape, you can finally shop Uniqlo confidently—without needing to order three sizes “just in case.”

“Find your size in 1,500+ brands real-time. It’s Free & Easy.”

Try it now:

👉 Create your free profile

👉 Log in anytime to view your Uniqlo size instantly

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