What Is Sizing Like at R13?

By Ella Blake — Fashion Stylist | Tellar Fashion Hub — Always honest, unbiased, & unsponsored

R13 runs small — often significantly so — and if you're shopping the denim for the first time, the near-universal advice from stylists and customers alike is to size up by at least one, and in many cases two, from your usual UK or US size. This is an American brand that uses US waist-inch sizing for its jeans, cuts a deliberately slim, body-close silhouette, and uses premium denim with very limited initial stretch. Don't let vanity get in the way of a good fit here: go bigger, get the right size, and thank yourself later.

R13 launched out of New York in 2009 and spent several years as a quietly whispered name among fashion editors before breaking into mainstream luxury consciousness. Founded with an obsessive focus on denim construction — washes, weights, cuts, hardware — the brand quickly became the reference point for what premium jeans could and should be. You'll find them on the pages of Vogue, draped over the legs of off-duty models, and in the wardrobes of women who've spent years looking for the perfect pair and finally stopped looking. I had a client once — a TV producer, absolutely no patience for faff — who bought her first pair of R13 skinnies, wore them for three days straight, and promptly ordered two more colourways. That's the R13 effect.

R13 Size Guide & Conversions

R13 jeans are sized in US waist inches (24 through 32 for most women's styles). Their ready-to-wear pieces use XS–XL. Here's how both systems map to UK and EU sizing — and crucially, what the actual waist and hip measurements look like before the denim stretches in:

R13 Denim Size (US Inch)UK SizeEU SizeWaist (inches)Hips (inches)2463424"34"256–834–3625"35"2683626"36"278–1036–3827"37"28103828"38"2910–1238–4029"39"30124030"40"3112–1440–4231"41"32144232"42"

R13 RTW SizeUK SizeEU SizeBust (inches)Waist (inches)Hips (inches)XS6–834–3632–33"24–25"34–35"S8–1036–3833–35"25–27"35–37"M10–1238–4035–37"27–29"37–39"L12–1440–4237–39"29–31"39–41"XL14–1642–4439–41"31–33"41–43"

💡 Ella's Sizing Rule for R13: Measure your natural waist and hips before you order anything. R13 denim uses rigid, high-quality fabric with minimal initial stretch — the measurements on the product are the measurements of the garment, not your body measurements with allowance. If your waist is 28 inches, start at a 29 or 30 and go from there. You want to be able to sit down and breathe. The denim will ease to your shape beautifully over the first few wears, but it needs to go on comfortably in the first place.

R13 Fits — What to Know Before You Buy

R13 is not a one-fit brand. The range spans everything from skinnies to wide-leg to relaxed boyfriend cuts, and the sizing advice shifts meaningfully between them. Here's my fit-by-fit breakdown:

Skinny & Kick Fit: The styles R13 built its reputation on. These are cut close through the thigh and knee with a very slim leg opening. They run the smallest of the range. Size up one to two — and if you're fuller in the thigh, size up two without hesitation. The kick flare version has a slight flare from the knee that makes it significantly more flattering on a wider range of bodies than a straight skinny.
Slim Straight (the "Bowie" and similar cuts): A slightly more forgiving fit through the hip and thigh than the skinny, with a clean straight leg. I'd still recommend sizing up one here — the waistband sits high and the cut is not generous. But this is the shape I'd point most of my clients towards. It's the everyday hero of the range.
Boyfriend & Relaxed Fits: R13's relaxed styles — the drop-crotch boyfriend, the wide-leg, the carpenter — are more forgiving and in many cases you can order your true waist measurement or even size down slightly. The roominess is by design and the proportions are balanced. These are the styles where R13 crosses over into genuine everyday wearability for a wider range of body types.
Cropped & Ankle-Length Styles: R13 does several cropped cuts and these tend to hit at different points on the ankle depending on your height. If you're 5'7" and above, these will sit as intended — mid-ankle, showing a clean strip of skin above a mule or loafer. If you're 5'4" and under, some crops can end up sitting at an awkward mid-calf. Check the inseam measurement on the product page before ordering.
Ready-to-Wear (Tops, Jackets, Leather Pieces): R13's ready-to-wear is lean and body-close. Their leather and moto jackets run particularly small in the shoulder and chest — if you're broad-shouldered or fuller in the bust, size up. Tops follow the same close-cut logic; true to size only if you like a fitted silhouette, otherwise go up.

The R13 Aesthetic — Is This Brand for You?

R13 occupies a very specific and rather enviable position in the denim market: it's the brand that serious fashion people reach for when they want to look effortlessly cool without looking like they're trying. The washes are extraordinary — faded indigos, vintage blacks, dusty whites that look like they've lived a whole interesting life before they reached your wardrobe. The hardware is considered. The denim weight feels substantial and expensive in a way that cheaper jeans simply don't.

The aesthetic leans heavily into New York cool — think Kate Moss-era nonchalance, a really good white T-shirt, and nothing to prove. If your wardrobe references are Parisian off-duty, early Helmut Lang, or you've spent years trying to find jeans that look properly worn-in without being distressed in a way that feels costume-y, R13 is going to make a lot of sense to you. It's a significant investment — most styles sit between £350 and £550 — but for clients who wear jeans as a genuine wardrobe cornerstone, the cost-per-wear calculation tends to look very reasonable after a year or two.

How to Style R13

The brand's strongest suit is pairing beautifully with simple investment pieces. Here's how I'd build outfits around the key fits:

The skinnies or kick fit — a tucked crisp white shirt, a good blazer, loafers or pointed ankle boots. The darkness of an indigo or black R13 skinny against a clean top is genuinely one of the most reliably polished looks going.
The slim straight — a slightly oversized vintage tee, a trench coat, clean white trainers. The fit gives you that slightly borrowed-from-the-boys nonchalance without drowning your frame.
The wide-leg or boyfriend — tucked broderie or satin blouse, heeled mule or strappy sandal. The volume in the leg needs balance at the top — don't do wide leg plus boxy top or you'll lose your shape entirely.

Brilliant Alternatives — Premium Denim at Every Level

R13 is exceptional but it isn't for every budget or every body. Here are the brands I'd send you towards depending on where you're shopping:

High Street & Mid-Market:

Levi's — The original reference point for everything R13 draws from aesthetically. Levi's 501s and the Wedgie fit in particular share R13's love of a vintage wash and a clean, unfussy silhouette. A fraction of the price, widely available, and the fit archive is extraordinary if you take time to explore it.
Abercrombie & Fitch — Genuinely one of the most improved denim offerings on the mid-market in recent years. Their Curve Love range and 90s straight have been widely praised by fashion editors and offer an R13-adjacent silhouette at a significantly lower price point.
Mango — Consistently strong denim, particularly their straight and wide-leg offerings. The washes are considered and the cuts flatter well. Great entry point for the clean, European denim aesthetic R13 inhabits.
Zara — Excellent for seasonally-relevant denim cuts that track closely with what the premium market is doing. The quality won't match R13 but the silhouettes often do, and the price is dramatically lower.
Topshop (via ASOS) — The Topshop denim archive, now available through ASOS, includes cult styles like the Jamie and the Editor that sit in very similar territory to R13's mid-rise skinny and straight shapes. Still well-priced and well-cut.
The Gap — Their straight and high-rise denim has had a genuine resurgence in credibility. Clean, simple, reliable — and sized in a way that makes it much easier to find your fit than R13's narrow waist-inch system.
All Saints — For the darker, more edgy end of the denim spectrum. Their slim and straight styles in washed black or deep indigo sit right in the mood R13 occupies, and quality has improved markedly in recent seasons.

Premium Options:

Citizens of Humanity — R13's closest premium competitor and arguably the most natural alternative. Beautiful washes, excellent construction, a wide range of fits from skinny to wide-leg, and sizing that is — crucially — slightly more generous and consistent than R13. Genuinely exceptional denim.
Paige — Premium American denim with a strong focus on fit and comfort. Their Hoxton and Transcend denim use stretch fabric that makes them significantly more forgiving to size in than R13's rigid cuts. Brilliant for women who want premium denim aesthetics with more day-to-day wearability.
Calvin Klein — The brand's premium denim line channels a clean, minimal, New York aesthetic that echoes everything R13 stands for — at a lower price point and with slightly more forgiving sizing.

Two Independent Labels Worth Discovering:

Ksubi — An Australian-founded independent that has quietly become one of the most credible names in premium denim internationally. Their cuts are exceptional, their washes are as considered as R13's, and the brand has a devoted fashion-insider following. Sizing also runs small, so apply the same size-up logic — but the aesthetic payoff is real.
Goldsign — A smaller, specialist denim label founded by former Paige executives and now considered one of the most technically accomplished premium denim brands in the world. Their body-mapped construction approach means the jeans are engineered to fit — genuinely worth knowing about if R13's proportions don't work for your shape but you want to stay in that luxury denim space.

R13 Sizing is Genuinely Tricky — Let Tellar Help

US waist-inch sizing, rigid denim with limited stretch, cuts that run small by design — R13 is one of those brands where getting the size right before you order matters enormously, especially at £400+ a pair. That's precisely what Tellar.co.uk is built for.

Tellar is the UK's leading clothing sizing tool — covering 1,500+ brands including R13, Citizens of Humanity, Paige, and hundreds more. It maps your actual body measurements directly to each brand's sizing, so you stop guessing and start shopping with confidence.

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