What Size Am I in M&S? The Ultimate M&S Sizing Guide
Author: Stylist and brand team at Tellar
Date: 2025
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Marks & Spencer (M&S) remains one of the UK’s most trusted clothing retailers, known for its dependable fit, classic silhouettes, and evolving modern collections. But despite their reputation, M&S sizing can vary considerably across product ranges, fits, and materials. This post breaks down how M&S sizing works, what to watch for, and how to find your exact size across categories—without ever guessing.
1. How Does M&S Sizing Work?
M&S uses standard UK sizing conventions, but with some critical differences depending on:
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Fit type (Regular, Petite, Long)
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Cut (e.g., Slim Fit, Relaxed, Straight)
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Product line (e.g., Autograph, Per Una, Collection)
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Garment type (e.g., jeans, knitwear, formalwear)
General Size Chart (Women’s Clothing)
UK Size |
Bust (cm) |
Waist (cm) |
Hip (cm) |
|---|---|---|---|
6 |
80 |
62 |
87 |
8 |
84 |
66 |
91 |
10 |
88 |
70 |
95 |
12 |
92 |
74 |
99 |
14 |
97 |
79 |
104 |
16 |
102 |
84 |
109 |
18 |
108 |
90 |
115 |
20 |
114 |
96 |
121 |
22 |
120 |
102 |
127 |
24 |
126 |
108 |
133 |
Note: M&S sizing is generally true to UK size, but some pieces (especially jeans and formalwear) can run slightly large due to generous ease for comfort.
2. M&S Fit Types Explained
🌿 Regular Fit
The default M&S fit—cut to accommodate average proportions. Regular is ideal for most women under 5'6" to 5'8".
✂️ Petite Fit
Designed for those under 5'3", with shorter torsos, rise, and hemlines. It’s not just a hem crop—the whole garment is proportioned differently.
📏 Long Fit
Suited to heights over 5’9”, with longer leg lengths, longer arms, and extra bodice length.
🧵 Fit Variations by Category
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Jeans & trousers: Available in Short, Regular, and Long leg lengths.
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Blazers & coats: Often Regular fit, but size down if between sizes (especially in double-breasted styles).
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Dresses: Petite range fits better in the shoulder and torso if you’re under 5'3".
3. M&S Jeans & Trousers Sizing
M&S offers waist + leg sizing in some jeans (e.g., 10 Short / 10 Regular / 10 Long), especially in Per Una and Autograph ranges.
Best Fit Tips:
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High-waisted styles like “The Mom Jean” may feel snug—go up a size if curvier through hips.
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Slim or sculpting fits (like Ivy or Lily) often include elastane—stick to your normal size unless between.
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Wide-leg or soft tailored trousers are often cut generously—consider sizing down for a closer fit.
Read more: The Ultimate Guide: Flattering Jeans for Every Body Shape
4. M&S Sizing by Collection
✅ M&S Collection
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Classic, mainstream fit.
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Sizes 6–24.
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True to UK size, forgiving through the waist and bust.
🖤 Autograph
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Slightly more tailored and premium cuts.
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Often slimmer through shoulders and waist.
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Size up if you prefer room to layer.
💐 Per Una
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Feminine cuts with ruffles, volume sleeves, and more relaxed silhouettes.
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Can run large in elasticated waists and jersey knits—try one size down if in between.
🧥 Goodmove (Activewear)
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Sizing depends on stretch level.
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Tops and leggings with high stretch usually run true to size.
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Jackets or zip-ups may run small—check garment-specific advice.
5. Men's M&S Sizing Guide
M&S Menswear uses standard UK sizes for tops and bottoms, but like the women's range, there are multiple fit types:
Size |
Chest (inches) |
Waist (inches) |
|---|---|---|
S |
36–38 |
30–32 |
M |
39–41 |
33–35 |
L |
42–44 |
36–38 |
XL |
45–47 |
39–41 |
XXL |
48–50 |
42–44 |
Shirt fits: Slim, Tailored, and Regular
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Slim – Size up if you’re muscular or have broad shoulders.
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Tailored – Versatile for most body types.
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Regular – Roomy across shoulders and chest.
6. Still Unsure? Use Tellar.co.uk for Precision
M&S doesn’t offer personal fit guidance—but Tellar.co.uk does. It’s the UK’s most advanced sizing tool that calculates your exact M&S size using your actual measurements or existing known brand size.
🔎 How It Works:
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Enter your bust, waist, and hip measurements—or select your size from a brand you already know fits.
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Tellar matches you to your ideal M&S size based on garment cut, stretch, and fit profile.
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Instant results—your M&S size appears alongside 1,500+ other brands.
🛠️ Try it now:
➡️ Use the Store Size Lookup Tool
➡️ Download the free printable measuring tape
No app needed, no downloads—just accurate, bias-free sizing in seconds.
7. Common Sizing Issues & Fixes
Problem 1: Dress fits in the bust, but too loose in the waist.
→ Choose Autograph or tailored styles. Or try a belt at the waist.
Problem 2: Jeans fit in the waist, but too long.
→ Select the Short leg version (M&S often offers 3 leg lengths).
Problem 3: Tops ride up or feel short in the torso.
→ Choose Long fit, or shop from the general women’s range instead of Petite.
8. Don’t Guess—Tellar It
With sizing differences across M&S ranges, it’s impossible to rely on a single size guide. But you don’t have to guess anymore.
Tellar.co.uk ensures you get it right—first time, every time.
✔️ No more trial-and-error returns
✔️ No more second-guessing measurements
✔️ No more confusing M&S fit charts
9. Find More Helpful Sizing Posts
10. Follow Tellar for Live Updates & Styling Advice
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Instagram: @Tellarsizing
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Twitter/X: @TellarSizing
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Facebook: Tellar Sizing
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Pinterest: TellarSizing
Final Word
M&S sizing is consistent in principle but variable in practice. Each collection, fabric, and garment type fits differently. Rather than guess, measure once and let Tellar.co.uk handle the rest. Whether you’re buying from Per Una or Autograph, jeans or dresses—Tellar tells you your real M&S size.
Find your size in 1,500+ brands real-time. It’s free & easy.