Does the Brand Marks & Spencer Run Big or Small, What Is Their Sizing Like?

Marks & Spencer (M&S) is one of Britain’s most recognisable high-street retailers, known for reliable quality, broad size ranges, and affordable wardrobe staples. From school uniforms to womenswear, tailoring to lingerie, M&S serves nearly every demographic—but the question remains: does M&S run big or small?

Before you scroll down, here’s what you need to know: Tellar.co.uk has analysed every single brand’s sizing data, including M&S. With a free measuring tape, a quick one-time setup, and instant access to sizing across 1,500+ brands, you’ll never have to check a size chart again.
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About Marks & Spencer: A British Retail Institution

Founded in 1884, Marks & Spencer has built a legacy of trust, comfort, and consistency. The brand spans multiple categories:

Everyday casualwear
Smart-casual and formalwear
Lingerie, hosiery and shapewear
Footwear, activewear and school clothing

In particular, M&S is known for inclusive sizing, often catering from UK size 6 to 24 across many lines. But this doesn’t mean all M&S pieces are sized the same.

So, Does M&S Run Big or Small?

Overall Verdict:

Marks & Spencer generally runs true to size, with some categories running slightly large, especially in looser fits or relaxed collections.

Here’s what that means in practice:

Category	Fit Feedback
Casualwear	Slightly generous
Tailoring	True to size
Lingerie	Reliable but varies by style
Denim	Can run large at the waist
Footwear	True to size with half-size options

Common Feedback:

Great for curvier or fuller body types
Generous hip and bust allowance in most items
Petite and tall ranges help improve fit for different heights
Less structured styles may feel roomy to shoppers used to slim-fit brands like Reiss or Zara

For exact sizing on trousers, skirts, bras, and more—use the Tellar Size Lookup Tool to match your measurements with M&S’s real fit data.

M&S Sizing by Product Category

1. Dresses

Fit: Relaxed in casual styles, true to size in workwear.
Tip: Stick to your regular UK size unless it’s a bodycon cut—then use your waist/bust ratio to determine fit.

2. Tailored Pieces

Includes blazers, pencil skirts, and structured trousers.
Fit: More accurate than fast fashion counterparts.
Tip: Use Tellar to compare across brands like Hobbs or Massimo Dutti.

3. Jeans & Trousers

Fit: M&S denim runs slightly generous at the waist; trousers often feature elastic inserts.
Tip: Use waist and hip measurements rather than relying on your standard jeans size.

4. Tops & Knitwear

Fit: Consistently roomy, especially in jersey and relaxed knits.
Tip: Consider sizing down if between sizes.

5. Lingerie

Famous for fit consistency, but not all bras are created equal.
Fit: T-shirt bras are reliably sized; push-ups and minimisers may feel tight.
Tip: Get your bust/band size right using Tellar’s measuring guide and tape.

How M&S Compares to Other High-Street Brands

Brand	Compared to M&S
Zara	Zara runs smaller
H&M	H&M is more variable
Reiss	Reiss is slimmer and more structured
White Stuff	Similar in fit, M&S more consistent
Next	Very similar overall

Want to explore more? Here are detailed sizing guides you’ll find useful:

Zara Fit Guide
Reiss Sizing Explained
White Stuff Sizing Overview
Massimo Dutti Size Breakdown

M&S Highlights: What to Buy (and How They Fit)

✦ Autograph Tailoring

M&S’s premium collection, known for flattering silhouettes and quality finishes.
Fit: Tailored and true to size.
Tip: Great for workwear wardrobes—use Tellar to match bust/shoulder fit precisely.

✦ Goodmove Activewear

Affordable gym wear that’s surprisingly stylish and practical.
Fit: Often stretchy and forgiving.
Tip: Size down if you prefer compression.

✦ Per Una and Soft Touch Ranges

Softer cuts and flowy designs for day-to-day dressing.
Fit: Generous; many shoppers recommend sizing down.
Tip: Use Tellar’s hip-to-waist tool to refine your size.

✦ Bras and Lingerie

M&S is one of the UK’s most trusted bra fitters.
Fit: Consistent for band sizes, variable for cup style.
Tip: Use Tellar’s free tape to update your bust measurements.

Why Standard Size Charts Aren’t Enough

Even a reliable brand like M&S can have fluctuations across styles or seasonal collections. That’s where Tellar.co.uk changes everything.

Why Tellar Is the Smarter Way to Size:

✅ Uses your actual body measurements (bust, waist, hips)

✅ Includes a free measuring tape with every setup

✅ Matches you to 1,500+ brands, not just M&S

✅ Works in centimetres or inches

✅ Completely free with no paywalls or gimmicks

Start in under 2 minutes → Tellar will do the rest

Related Fit Guides You’ll Find Helpful

Shopping across the UK high street or beyond? Explore these next:

White Stuff Fit Guide
H&M: Big or Small?
Massimo Dutti Fit Explained
Zara: Is It True to Size?

Or explore the full Tellar Brand Sizing Blog Library.

Follow Tellar for Weekly Sizing Insights

Stay ahead of size shifts, trend analysis, and insider fit tips:

Final Thoughts: Is M&S True to Size?

Yes—for the most part. M&S is one of the most reliable UK brands when it comes to sizing. That said, fit can vary by category, and relaxed fits often feel oversized, especially compared to slimmer-cut brands.

For true confidence—whether buying bras, suits, or jeans—use Tellar.co.uk to get the right size first time.

Know Your M&S Size Instantly

🎯 Want to know your M&S size in jeans, blazers, bras or dresses?

Create your Tellar profile here
Use the brand size lookup tool
No more guessing. No more size chart confusion.

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