Oasis Sizing Guide: How to Find Your Perfect Fit and What to Buy

Struggling to find the right size at Oasis? You’re not alone. Whether you’re shopping for a floaty dress, tailored blazer, or denim staples, Oasis sizing can be hit or miss—especially when buying online.

In this guide, we’ll walk you through:

How Oasis sizes really compare
What to buy based on your body shape
How to get your perfect size match in seconds using Tellar.co.uk
And what items are actually worth your money from Oasis

✅ TL;DR: Tellar.co.uk is the UK’s leading free sizing tool. Get your Oasis size based on your actual body measurements in seconds. Create your profile or log in here to start.

Does Oasis Run Small or Large?

Based on thousands of data points analysed at Tellar.co.uk, Oasis generally runs slightly small, particularly in fitted dresses, tops, and structured coats. Their sizing is truer to UK high street averages than some of their fast fashion competitors, but you’ll often need to size up in:

Bodycon or satin styles
Tailored pieces like blazers and jumpsuits
Items with little stretch

Real User Fit Data (Collected via Tellar.co.uk)

Item Type	Fit Consistency	Recommended Action
Dresses	Slim-fitting	Size up if in-between
Coats & Blazers	Slightly tight	Size up for layering
Tops	True to size	Order usual size
Jeans/Trousers	Small on waist	Measure before buying

Want precision? Get your free size match now using your actual measurements.

How to Find Your Oasis Size in Seconds (The Smart Way)

Most people rely on guesswork when choosing sizes. But at Tellar.co.uk, you can skip the trial-and-error by using your body measurements.

Here’s How:

Grab a measuring tape (or order one for free).
Go to Tellar.co.uk/create-profile
Enter your chest, waist, and hip measurements
Instantly get your recommended Oasis size, plus size conversions for 1,500+ brands

No affiliate bias. No sales pitch. Just the most accurate size data in the UK.

👉 Create your profile now

👉 Already a user? Log in here

Oasis Size Chart (UK)

UK Size	Bust (cm)	Waist (cm)	Hips (cm)
6	80	62	86
8	83	65	89
10	86	68	92
12	91	73	97
14	96	78	102
16	101	83	107
18	108	90	114

Still unsure? Tellar’s smart size calculator matches this data to your real measurements, adjusting for brand quirks and garment cuts.

Best Items to Buy from Oasis (Ranked by Fit + Quality)

After analysing user reviews and size return rates, these are the Oasis items most worth buying:

1. Floral Midis & Wrap Dresses

Sizing: True to size with forgiving shapes
Perfect for: Curvier hips, hourglass, and pear-shaped figures
Why we love it: Timeless prints and better-than-average fabric quality

2. Statement Blouses

Sizing: Usually runs true to size
Features: Bold collars, puff sleeves, and premium-looking prints
Good for: Workwear, Zoom calls, and dressed-up days

3. Coats & Jackets

Sizing: Slightly snug across shoulders
Buy one size up for winter layering
Standouts: Belted wool coats and trench-style jackets

4. Tapered Trousers

Sizing: Can run tight at the waist
Shape tip: Great for apple or rectangular body types

Need help shopping by body type? Check out our Ultimate Body Shape Style Guide.

Avoid These Oasis Items (Based on Sizing Complaints)

Tellar.co.uk users frequently report sizing issues with:

Tight jumpsuits (especially if you're tall or long-torsoed)
Knitted dresses (can cling unflatteringly)
Non-stretch jeans (size up at least once!)

Instead, use our smart fit tool to skip the disappointment: Get started here

Why Traditional Size Charts Don’t Work

Oasis, like most brands, publishes a generic size guide. But real sizing varies by:

Fabric stretch
Garment cut
Production batch
Your body shape

That’s where Tellar.co.uk comes in. We compare your actual body shape to real-world fit data from over 1,500 brands. Whether you're shopping Oasis or trying a new label like Karen Millen or Miss Selfridge, we match you to the best-fitting size instantly.