Does the Brand Primark Run Big or Small? What Is Their Sizing Like

Whether you're picking up basics on a budget or looking for trend-led fashion at high-street prices, Primark is a go-to for millions of UK shoppers. But one question always comes up: Does Primark run big or small?

📏 Tellar.co.uk helps you find your size in thousands of brands—and we’re adding more every day. You’ll get a free measuring tape, set up your profile once, and get instant sizing guidance in seconds. No guesswork. No size charts. 100% free.

In this guide, we’ll break down how Primark sizing compares to standard UK brands, which categories run large or small, and how to shop more confidently—especially if you’re between sizes, buying lingerie, or shopping for kids.

About Primark: Fast Fashion, Accessible Fit

Founded in 1969, Primark is now one of the most recognisable names on the UK high street. The appeal? Trend-led pieces, seasonal staples, and wardrobe basics at unbeatable prices.

The brand offers:

Menswear and womenswear
Denim, outerwear, casualwear
Shoes and accessories
Lingerie and nightwear
Kids and baby clothing
Homeware and beauty

But despite the wide offering, Primark sizing often feels unpredictable, especially compared to brands like M&S, H&M or Zara. That’s where Tellar.co.uk comes in—to give you instant, size-matched answers across all categories.

So—Does Primark Run Big or Small?

Primark generally runs small across most women’s and men’s clothing. However, sizing varies significantly by fabric type, cut, and garment category. Many customers find themselves:

Sizing up in trousers, fitted dresses, or formal shirts
Sizing down in casual or oversized tops
Struggling to find consistent sizing across ranges

🔍 Tellar’s Store Size Lookup Tool compares your measurements to Primark’s cuts—instantly. We factor in waist, hip, chest, and height to deliver the best fit recommendation.

UK vs Primark Size Conversion

UK Size	Primark Fit Estimate	Notes
UK 6	Often fitted or short in rise
UK 8	Runs small in tailored pieces
UK 10	Generally true to size
UK 12	Slightly tight in waistbands
UK 14	May need sizing up in jeans
UK 16	Varies by category—generous in jumpers, tighter in trousers
UK 18+	Some availability, often cut small in structured items

🧵 Create your Tellar profile now to get the best size in Primark and thousands of other brands, tailored to your exact shape.

How Primark Fits by Category

1. Womenswear (Tops, Dresses, Jeans, Jackets)

From ribbed basics to sparkly partywear.

Fit: Often smaller than standard high-street brands
Size Tip: Size up in fitted dresses, trousers, and woven fabrics
Tellar Tip: Tellar calculates bust, waist, hip and height to assess best size by item

2. Menswear (T-Shirts, Shirts, Joggers, Coats)

Basics and fashion pieces for everyday wear.

Fit: T-shirts and joggers = true to size; shirts = small in shoulder
Size Tip: Size up in slim-fit shirts and structured coats
Tellar Tip: Shoulder and chest measurements are key—Tellar uses both

3. Denim (Jeans, Jackets, Shorts)

Affordable denim in all styles—from skinny to wide-leg.

Fit: Often small in the waist, short in the rise
Size Tip: Size up if between sizes or curvy
Tellar Tip: Tellar accounts for rise, stretch content, and your waist/hip ratio

4. Lingerie & Nightwear

Bralettes, pyjamas, shaping shorts, and more.

Fit: Sizing is inconsistent—especially in bras
Size Tip: Use your actual bust and underbust, not dress size
Tellar Tip: Tellar delivers accurate results by comparing real measurements to garment data

5. Kidswear & Baby Clothes

Affordable essentials for fast-growing little ones.

Fit: Tends to run small
Size Tip: Size up for longer wear
Tellar Tip: Tellar includes child’s age, height and weight for a better match

Why Primark Sizing Feels Inconsistent

Despite having UK-based roots, Primark works with multiple suppliers across global markets, leading to:

Differences in fabric tolerance and pattern grading
No consistent size charts across all ranges
Minimal info on inseams, bust darts, or sleeve lengths
High variation between casualwear and structured styles

That’s why shoppers who want to save time and avoid returns are switching to Tellar.co.uk—which uses real garment and brand data to make accurate size matches.

🎁 You’ll receive a free tape measure and one-time profile setup. From then on, it works across every brand you shop.

Popular Primark Pieces (And How They Fit)

⭐ High-Rise Skinny Jeans

Stretch denim, multiple colourways

Fit: Small in the waist and short in rise
Tellar Tip: Waist-to-hip ratio and rise length calculated

⭐ Oversized Jumpers & Sweatshirts

Boxy cuts, slogan styles

Fit: Generous and comfy
Tellar Tip: Size down for a neater shape

⭐ Formal Shirts & Blazers (Menswear)

Slim cut, basic tailoring

Fit: Small in shoulder and chest
Tellar Tip: Shoulder width and chest size used to avoid tight fit

⭐ Lingerie Bralettes & Sets

Stretch fabrics, often labelled S–L

Fit: Inconsistent between styles
Tellar Tip: Bust and underbust data mapped to brand sizing internally

Why Use Tellar.co.uk for Primark and Everyday Brands?

Tellar works across budget, premium and luxury brands—giving you consistent sizing based on your real body measurements.

✅ Free measuring tape

✅ One-time setup

✅ No charts, no guesswork

✅ Find your size in thousands of brands

✅ Always free to use

🎯 Create your free Tellar profile now and enjoy effortless sizing, from Primark to Prada.

Follow Tellar for Weekly Fit Tips, Brand Comparisons & Tools

Final Verdict: Is Primark True to Size?

Not always. Primark often runs small—especially in denim, lingerie and tailored items. Knitwear and casualwear are more forgiving. Fit inconsistencies are common, but easy to solve with the right tools.

That’s where Tellar.co.uk steps in. Your measurements. Their cut. Instant match.

✅ Ready to Find Your Primark Size?

Find your size in thousands of brands. It’s free & easy.

Does the Brand Primark Run Big or Small? What Is Their Sizing Like—and What’s Worth Buying?