Does No.21 Run Big or Small? Sizing Guide & What to Buy
Author: Stylist and brand team at Tellar
Date: 2025
Honest. Unbiased. Independent. Free. We promise.
We will never be influenced by brands - just the perfect Fit, Size & Style for you. Search thousands of honest posts for free, written by our stylists - your own personal shopper.
Luxury Italian Fit Guide | Tellar.co.uk
Tailored Meets Edgy: But What’s the Fit Like at No.21?
No.21 — or Numero Ventuno — is the cult Milanese label founded by Alessandro Dell’Acqua. It’s known for mixing masculine tailoring with feminine elements: think sequinned skirts styled with oversized shirts, or clean-cut blazers paired with sheer knits. Loved by fashion editors and minimalist dressers alike, the brand sits at the intersection of runway polish and modern wearability.
But if you’re shopping online, one issue still causes hesitation:
Does No.21 run big or small?
🧵 Want your fit matched in seconds? Create your free profile at Tellar.co.uk and instantly discover your correct No.21 size — plus your size in 1,500+ fashion brands. One-time setup, always free, and includes a printable measuring tape. We’ve analysed every single brand’s size data — so you never have to guess again.
No.21 Sizing: Runs Small in Most Tailored & Fitted Pieces
No.21’s aesthetic favours structure, precision and Italian cuts — which often means slimmer shoulders, narrower sleeves, and tighter waists. Across both men’s and women’s collections, many pieces run small, particularly in blazers, trousers, and buttoned styles.
Women’s Fit Overview
-
Shirts & Blouses: Often run small, especially through the shoulders and chest. Size up for comfort.
-
Tailored Dresses: Sleek but fitted — size up if curvier through the hips or bust.
-
Trousers & Skirts: High-waisted and narrow, especially in woven fabrics. Slim through the hips.
-
Oversized Jumpers & Knits: Designed to be loose — true to size, occasionally generous.
Men’s Fit Overview
-
Tailored Shirts & Blazers: Slim Italian fit — runs small for most UK builds.
-
Trousers: Fitted at the waist and thigh. Size up for more relaxed leg lines.
-
T-Shirts & Sweatshirts: Usually true to size, but often short in length.
🎯 Find your exact No.21 size right now using Tellar’s instant lookup tool
Why No.21 May Feel Smaller Than Expected
There are three reasons shoppers often find No.21 tighter than expected:
-
Italian sizing — closer to EU fit conventions than UK vanity sizing
-
Tailoring DNA — much of the collection draws from traditional menswear cuts
-
Use of structured fabrics — many styles use satin, poplin, wool, or gabardine with no stretch
That means even items that look fluid on the model may feel close-fitting in real life.
Tellar Community Fit Feedback
Item Type |
Runs Small |
True to Size |
Runs Large |
|---|---|---|---|
Women’s Shirts |
✅ |
✅ |
|
Tailored Dresses |
✅ |
✅ |
|
Blazers & Coats |
✅ |
✅ |
|
Knitwear |
✅ |
✅ |
|
Men’s Trousers |
✅ |
✅ |
🧵 Related Tellar.co.uk sizing guides for similar brands:
What’s Worth Buying from No.21?
1. Structured Shirts & Oversized Poplins
Clean lines and crisp cottons. Size up in traditional styles. For oversized pieces, true to size.
2. Tailored Dresses with Unexpected Detailing
Often fitted and architectural. If you have a fuller bust or hips, size up for comfort.
3. Coats & Wool Blazers
Beautifully tailored with sharp lines. Go up a size if layering or if you have broad shoulders.
4. Knitwear & Pullovers
These tend to be more relaxed and true to size, particularly in mohair or cashmere blends.
5. Embellished Skirts & Evening Trousers
Signature No.21 — strong shapes and luxe finishes. Slim through the hip, so size up if needed.
🧵 Use Tellar.co.uk to instantly compare your No.21 size to other brands you already wear
Key Fit Tips for No.21 Buyers
-
Structured = size up: any garment made of satin, poplin, or suiting will run slim
-
Watch the shoulders: women’s shirts and dresses are cut narrow through the back
-
Double-check length: men’s tees and some trousers run shorter than expected
-
Oversized doesn’t mean generous: many pieces look oversized but still fit tight at pressure points
🎯 Tellar.co.uk gives you instant size accuracy based on your real body — no guesswork, no returns
Why Tellar.co.uk Is Essential for Buying No.21
Designer labels like No.21 don’t follow standard UK sizing. And with luxury pricing, a sizing mistake can be costly. That’s why Tellar.co.uk helps you shop smarter:
-
✅ Real-world sizing mapped to your body measurements
-
✅ One-time setup = access to 1,500+ brand fits instantly
-
✅ Built-in size conversion for UK / EU / IT / US
-
✅ Always free to use — no login needed to view your results
-
✅ Free printable measuring tape included
🧵 Create your Tellar profile now and check your No.21 size instantly
Related Brand Fit Guides You’ll Love
📲 For expert fit breakdowns and daily style tips, follow us:
Final Verdict: Does No.21 Run Big or Small?
-
Shirts, dresses and tailored items run small
-
Trousers and skirts are slim-cut, especially at the waist and hips
-
Knitwear and oversized styles are more forgiving
-
Sizing up is often the safe choice, especially in fitted pieces
Still unsure? Don’t rely on assumptions — let Tellar.co.uk give you real-time accuracy, tailored to your measurements.
Conclusion:
Find your size in 1,500+ brands real-time. It’s free & easy.
Only at Tellar.co.uk — the UK’s leading clothing size tool.