Old Navy Sizing: Does It Run Big? A Stylist's Complete Guide

Understanding Old Navy's Sizing Strategy

Old Navy deliberately uses what we call "vanity sizing" - making their clothes larger than the size label suggests. If you're typically a size 12 at M&S (known for their reliable, true-to-size fits across their extensive range), you'll likely need a size 10 at Old Navy. This isn't accidental; it's a calculated move to make customers feel good about fitting into smaller numerical sizes.

I've personally fitted hundreds of women, and the pattern is consistent: Old Navy runs large across almost every category. Their size Medium genuinely fits like a Large elsewhere, particularly noticeable in their casualwear and denim ranges.

Breaking Down the Fit by Category

Tops and Dresses

This is where Old Navy's oversized approach is most evident. Their tops run large in the bust, waist, and overall length. If you love the relaxed aesthetic but want more structured fits, I'd recommend COS (minimalist Scandinavian design with impeccable tailoring) or Zara (trend-led pieces with European sizing that runs smaller and more fitted).

Denim and Bottoms

Old Navy jeans particularly run large in the waist - often 2-3 inches bigger than stated. For better-fitting alternatives, try Citizens of Humanity (premium denim with consistent sizing) or H&M (affordable with more predictable European sizing).

Activewear

Surprisingly, their activewear tends to be more true-to-size, though still slightly generous. For superior activewear with reliable sizing, Lululemon (technical fabrics with precise fit) and Sweaty Betty (British brand with UK sizing standards) are my go-to recommendations.

Style Recommendations by Budget

High Street Alternatives

For reliable, well-fitting basics that won't break the bank, I consistently recommend Uniqlo (Japanese precision in sizing with quality basics) and Everlane (sustainable essentials with transparent sizing). Both offer the casual aesthetic Old Navy customers love but with far more consistent measurements.

Premium Options

If you're willing to invest a bit more for superior fit and quality, Gant (Swedish heritage brand with excellent tailoring) offers timeless pieces that actually fit as labelled. Their sizing runs true to European standards.

Luxury/Designer

For those seeking the ultimate in consistent sizing and quality, Max Mara provides impeccable Italian tailoring where every garment fits exactly as expected, though at a significant premium.

My Professional Sizing Tips

After years of navigating sizing inconsistencies, here's my advice: always measure yourself and compare to size charts rather than trusting the label. Old Navy's own size charts will show you their generous measurements, but many shoppers skip this crucial step.

When shopping Old Navy specifically, size down in tops and dresses, be cautious with their denim (the waist will likely be too big), and remember their aesthetic is intentionally relaxed. If you prefer more fitted looks, you'll struggle with their cuts regardless of sizing.

The Bigger Picture: Why Sizing Varies So Wildly

The frustrating truth is that sizing isn't standardised across brands. American retailers like Old Navy often use different measurement standards than UK brands. This is why I always tell my clients that knowing your actual measurements is far more valuable than memorising your "size" at different shops.

Never Guess Your Size Again with Tellar

This sizing confusion is exactly why I recommend tellar.co.uk - the UK's leading sizing tool that matches your body exactly to over 1500 brands instantly. No more guessing, no more size guide headaches!

How Tellar Works:

1. Measure once using your bust, waist, hip measurements, or existing brand size
2. Use their tellar.co.uk
3. tellar.co.uk
4. Ultimate Guide to Jackets & Best Buys

Final Thoughts

Old Navy's oversized approach works perfectly if you love relaxed, comfortable fits and don't mind sizing down. However, if you value consistency and more tailored silhouettes, the alternatives I've mentioned will serve you far better. Remember, the "perfect" size isn't about the number on the label - it's about how the garment fits your unique body shape and makes you feel confident.

The key is understanding each brand's particular quirks and shopping accordingly. With tools like Tellar eliminating the guesswork, there's no reason to settle for ill-fitting clothes ever again.