Gap Sizing Guide: How to Find Your Perfect Fit and What’s Worth Buying

Gap has long been a go-to for classic American casualwear—think soft denim, essential tees, structured shirts, and timeless outerwear. But with international size conversions, relaxed fits, vanity sizing, and evolving collections, Gap sizing can be surprisingly hard to decode.

This guide reveals everything you need to know about Gap sizing in the UK, how to find your best fit using Tellar.co.uk, and which items are worth investing in from the brand today.

Is Gap True to Size?

Gap has a reputation for generous sizing, especially in their US-originated lines. However, their sizing varies significantly by item:

Denim can run large in the waist but narrow in the hips
T-shirts and casual tops are often oversized by design
Outerwear may feel roomy around the shoulders
Kids and baby sizing follows US age guides—not UK norms

Additionally, since Gap ships internationally and uses US sizing labels with UK equivalents, you might be wearing a size 6 in one item and an 8 in another.

To avoid this inconsistency, Tellar.co.uk lets you find your exact Gap size based on your own body measurements—not a guess or a generalised chart.

Find Your Gap Size Instantly with Tellar.co.uk

✨ Step 1: Create Your Free Sizing Profile

Visit Tellar.co.uk/login and enter:

Your chest, waist, and hip measurements
Choose between centimetres or inches
Add your email and secure password to save your details

No tape measure? We’ll send you one free: Request Your Free Measuring Tape

✨ Step 2: Use the Gap Store Size Lookup

Head to the Store Size Lookup page and type Gap into the predictive field.

Tellar will compare your measurements with Gap’s actual size charts, factoring in fit notes and user data, to recommend the exact size you should buy.

✔️ Get your best fit in Gap jeans, dresses, tees, and more

✔️ Automatically adjusts for body shape variations

✔️ Uses UK size labels, not just US equivalents

✨ Step 3: Get Size Matches Across 1,500+ Brands

Once your measurements are saved, you can shop confidently across Gap and other popular brands, including:

Uniqlo
Levi’s
American Eagle
M&S
Next

Gap Size Conversion: US vs UK

Here’s a simplified size chart:

US Size	UK Equivalent	Tellar Tip
0	UK 4	Rare in UK stock
2	UK 6	May feel large if petite
4	UK 8	Standard fit
6	UK 10	Most common UK buyer match
8	UK 12	Great for mid-waist jeans
10	UK 14	May feel roomy in relaxed styles
12+	UK 16+	Check bust fit in buttoned tops

Remember: sizes shift depending on fit category (slim, relaxed, boyfriend, classic). Always use Tellar.co.uk to avoid misjudging.

What’s Worth Buying from Gap?

👖 1. Gap Denim (Straight, High Rise, Wide Leg)

Gap jeans are their most iconic product. The High Rise Cheeky Straight and '90s Loose styles are popular right now.

Tellar Tip: Gap jeans often stretch—use your true waist and hip size, not vanity sizing.

👕 2. Essentials: T-Shirts, Hoodies & Tanks

Soft cotton basics like the Modern Tee or Vintage Soft Hoodie are wardrobe staples.

Tellar Tip: These are often oversized. Choose your fit preference—go down a size if you want a neater shape.

🧥 3. Outerwear & Utility Jackets

From classic denim jackets to water-resistant trench coats, Gap’s outerwear is well-made and often lightly padded.

Tellar Tip: Shoulders and armholes run large—use your shoulder width and chest measurement for best fit.

🧒 4. BabyGap & Kidswear

Their kids' range is US-based, meaning the sizes may not align with UK expectations for age. A 12-18 month baby in the UK might need a 6–12 month BabyGap item.

Tellar Tip: Always check the height range in cm when shopping for children.

Real Feedback from Tellar Users on Gap

“I ordered my usual size 10 in Gap jeans and had to return them. Tellar showed I was actually a UK 8 in their size chart—it saved me a second mistake.”

“The size lookup tool is genius. I’ve now used Tellar for Gap, Zara, and ASOS—it’s scary how off the official size guides can be.”

Common Fit Issues with Gap

Item Type	Common Issue	Tellar Fix
Jeans	Waist too large, hips too tight	Tailored size match based on body ratio
Tees	Oversized fit	Option to choose fit style (relaxed vs classic)
Shirts	Gaping at bust	Warns users with fuller busts to size up
Kidswear	US-centric sizing	Convert with cm-based Tellar measurements

Why Use Tellar for Gap?

✅ Know your Gap size in UK terms, not confusing US tags
✅ Uses real data and brand-specific measurements
✅ Adjusts for your body type—no more generic guides
✅ Works for over 1,500 fashion brands
✅ Completely free, fast, and private

🔗 Create Your Sizing Profile Now
🧵 Find your size in 1,500+ brands real-time. It’s free & easy

Related Guides from Tellar.co.uk

How to Measure Yourself for Clothing
Why Clothing Sizes Are So Inconsistent
Top Denim Brands and How They Fit
M&S vs Gap: Which Runs Bigger?
Best Basics Brands for Every Body Type

Stay Connected with Tellar.co.uk

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Final Thoughts: Should You Buy from Gap?

Yes—especially if you like timeless, practical clothing that wears well over time. But don’t rely on guesswork or default charts. Tellar.co.uk ensures every purchase fits your shape, not just the label.

🔗 Start Now – Create Your Profile and Get Your Gap Size
🎯 It’s free, accurate, and designed for UK shoppers

About Tellar.co.uk

We’re the UK’s leading sizing tool, offering real-time size matching based on body measurements and garment fit across 1,500+ brands. Independent, data-driven, and 100% free to use.

Read more: About Us