River Island vs Levi's Jeans Sizing: The Complete Guide

River Island jeans typically run one size smaller than Levi's, meaning if you're a size 12 in Levi's, you'll likely need a size 14 in River Island. As someone who's spent years fitting clients in both brands, this sizing discrepancy catches out so many shoppers—but once you know the secret, you'll never get caught out again.

The Sizing Reality: What Every Woman Needs to Know

Here's the truth about these two denim giants: River Island follows fast-fashion sizing trends, which means their cuts tend to be more fitted through the waist and hips compared to Levi's classic American sizing. Levi's, with their heritage denim expertise, tends to be more generous, particularly in their vintage-inspired cuts like the 501s and Ribcage styles.

Stylist's Tip: Always try River Island jeans in-store if possible. Their sizing can vary dramatically between different styles within the same size range.

The key difference lies in the cut philosophy. River Island designs for the contemporary British figure with a focus on creating that Instagram-worthy silhouette—think high-waisted, curve-hugging fits that can feel restrictive if you size down. Levi's, conversely, prioritises comfort and movement, with more room through the thighs and a relaxed approach to waist measurements.

Brand-by-Brand Sizing Breakdown

High Street Alternatives

ARKET: Runs true to size, similar to Levi's sizing. Their organic cotton denim is brilliantly consistent.

& Other Stories: Tends to run small like River Island, but with more stretch for forgiveness.

Weekday: Swedish sizing runs generous—try a size down from your usual River Island size.

Premium Options

Ganni: Danish brand with quirky cuts that run true to size but with unique proportions—brilliant for petites.

Reformation: Size up one from River Island—their sustainable denim is cut for curves but runs snug.

Wood Wood: Scandinavian cool with generous sizing, similar to Levi's approach.

Luxury/Designer Choices

Toteme: Swedish minimalism at its finest—runs large, so size down from Levi's.

Agolde: LA-based brand with vintage-inspired cuts that run true to Levi's sizing.

Frame: Premium denim that's cut for the American market—size down one from Levi's for the perfect fit.

The Fit Files: Style-Specific Guidance

River Island's "Molly" jeggings run incredibly small—I always recommend going up two sizes from your Levi's measurement. Their straight-leg styles are more forgiving but still run smaller than Levi's equivalent cuts. For Levi's, the 720 High Rise Super Skinny runs smaller than their classic 501s, so don't assume all Levi's styles fit identically.

The stretch factor is crucial here. River Island incorporates more elastane into their denim blends, which means they'll mould to your body but may feel restrictive initially. Levi's uses minimal stretch in their heritage styles, relying instead on the natural give of quality cotton denim that improves with wear.

Shopping Strategy: Never Get Caught Out Again

My foolproof approach? Measure your best-fitting jeans and compare them to size charts rather than relying on the size label. River Island's size 12 typically measures 30-31 inches at the waist, while Levi's size 12 sits closer to 32-33 inches.

For online shopping, always check the return policy. River Island offers 28 days for returns, while Levi's provides 30 days—both brands are generally excellent with exchanges if the sizing doesn't work out.

Never Guess Your Size Again with Tellar.co.uk

Stop playing the jeans sizing lottery! Tellar.co.uk is the UK's leading sizing tool that matches your body exactly to over 1500 brands instantly. No more size guide confusion, no more returns—just perfect fits every time.

How Tellar Works:

Measure once using your bust, waist, hip measurements, or input your existing brand size
Use the Store Size Lookup tool to get your precise size in any brand—River Island, Levi's, COS, Reiss, Everlane, Arket, and hundreds more
Always free, no downloads needed—works seamlessly in your browser

Plus, explore the Tellar Fashion Hub—a library packed with free posts from top stylists. Honest, unbiased, independent advice that's always free, covering everything from style guidance to best brand picks.

Essential Reading from Tellar Fashion Hub:

The Bottom Line

River Island runs smaller than Levi's—it's that simple. But understanding why makes all the difference to your shopping confidence. River Island prioritises contemporary fit and trend-led styling, while Levi's champions comfort and classic proportions. Both have their place in a well-curated wardrobe, but knowing how to navigate their sizing differences will save you time, money, and the frustration of ill-fitting jeans.

Remember, the best jeans are the ones that fit your body perfectly, regardless of the size on the label. Use tools like Tellar to take the guesswork out of online shopping, and never settle for "close enough" when perfect fit is achievable.