Why Not Brand Size Guide: Find Your Fit in Why Not Brand with UK Sizing Help

Shopping from Why Not Brand but unsure what size to choose? You’re not alone. This minimalist-meets-streetwear label is known for its edgy silhouettes, bold branding, and androgynous tailoring — but sizing can vary depending on the style and collection. Whether you're shopping denim, oversized tees or tailored outerwear, getting your size right is essential.

That’s where Tellar.co.uk comes in.

We’re the UK’s leading free sizing tool. One quick profile and you can see your best-fitting size in over 1,500+ brands — including Why Not Brand. No more guessing, no more returns.

Why Not Brand Sizing: What You Need to Know

Why Not Brand blends Italian street culture with global fashion trends. Expect oversized fits in hoodies, dropped shoulders in outerwear, and tapered joggers with elastic waistbands.

But here's the catch: their sizing doesn’t follow a consistent formula. Some garments are labelled S/M/L, others use Italian or EU sizing, and many run intentionally oversized for aesthetic purposes.

So how do you know what will actually fit?

You measure once. We handle the rest.

How Tellar.co.uk Solves the Sizing Guesswork

When you enter your body measurements (or simply tell us a brand and size you already wear), Tellar compares that data to Why Not Brand’s size chart — and thousands of others.

We use real data, not rough conversions.

If your chest measures 90cm and Why Not Brand’s Medium fits 94–98cm?
We’ll tell you Medium is ideal — not Large or Small.
We’ll even flag if a Why Not Brand hoodie runs big in the current season — and recommend sizing down.

▶️ Create your free profile now and unlock personalised size advice instantly.

Does Why Not Brand Run Small or Large?

From our Tellar data:

T-shirts and sweatshirts typically run true to size
Oversized outerwear may fit up to one full size larger than standard UK cuts
Tapered bottoms may run narrow at the ankle but stretch at the waist
Some Italian-made pieces follow EU measurements — always check the chart or use Tellar

🟢 Want to avoid second-guessing?

Use our size recommendation tool and instantly see what fits you, based on your own body or a brand you already wear.

Sizing Examples by Category

Product Type	Tellar.co.uk Fit Tip
Oversized Hoodie	Size down if in between sizes
Crewneck Tee	True to size (check shoulder width)
Joggers	Waist has give, but leg may taper tightly
Blazers	Structured, check shoulder + sleeve
Graphic Tees	Slightly boxy, good for layering

All these insights are built into Tellar — just input your chest, waist, and hip measurements once, or tell us you’re a UK 10 in Zara or a US 6 in Reformation. We’ll handle the rest.

Why Tellar.co.uk Is a Smarter Way to Shop Why Not Brand

⏱ Takes 30 seconds to set up

📏 Free measuring tape posted on request

👚 Match your size to 1,500+ global fashion brands

📲 Works on desktop and mobile

🎯 One-time profile = personalised size matches forever

👉 Try it now — it’s free and easy.

Follow Us for More

For the latest brand size guides, fit tips and updates:

Instagram: @Tellarsizing
Pinterest: TellarUK
Twitter/X: @Tellar100
Facebook: TellarSizing

Final Thoughts

Why Not Brand is fast becoming a cult favourite, but its sizing structure can confuse UK shoppers. Rather than risk a return or waste time reading multiple charts, try Tellar.co.uk and get a tailored recommendation in seconds.

Find your size in 1,500+ brands real-time. It’s free & easy.

👉 Start here