What Is Sizing Like at Marni?

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

Marni follows standard Italian EU sizing and generally runs true to size — but here's the catch: many of Marni's most iconic pieces are deliberately, architecturally oversized, which makes understanding what you're actually buying genuinely tricky. This is a brand where the design intention matters as much as the label. Get it right, and you'll look like you've stepped off a Milan street style page. Get it wrong, and you'll just look like you've borrowed someone else's clothes.

I have a soft spot for Marni that borders on unhealthy. The brand's unique mix of clashing prints, unusual proportions and artisan craftsmanship is genuinely unlike anything else in luxury fashion. But I've also had moments staring at a Marni sizing chart thinking — is this piece supposed to fit like this, or have I made a terrible mistake? The answer, usually, is: it's supposed to fit like this. Marni is not a brand for the faint-hearted, or those who like their clothes to simply match their body shape neatly.

The Size Conversion Table

Marni uses Italian EU sizing across its womenswear. Use the table below as your starting point — but always cross-reference with the specific garment's measurements, because the intended silhouette varies enormously by piece.

Marni (IT/EU)UK SizeUS SizeApprox. Bust (cm)Approx. Waist (cm)Approx. Hip (cm)368482–8463–6588–903810686–8867–6992–944012890–9271–7396–9842141094–9675–77100–10244161298–10079–81104–106461814102–10483–85108–110

Key point: unlike some Italian brands where you simply size up across the board, Marni requires you to know the garment's intended fit. A Marni coat labelled EU 40 might be designed with 20cm of ease built in. A Marni trouser in the same size might be quite slim. Always read the product description carefully and, wherever possible, check the flat measurements.

Sizing by Garment — What You Actually Need to Know

This is where it gets interesting. Marni's fit philosophy shifts dramatically depending on the category, so here's my garment-by-garment breakdown:

Dresses: Marni dresses range from deliberately sack-like volumes (size down, or trust your usual EU equivalent) to quite fitted shirt dresses and slip styles (true to size or size up if you're between). The brand's signature drop-waist and A-line styles are generally forgiving. The more structured slip dresses are not — they fit precisely across the chest.
Knitwear: This is Marni at its most playful and also its most oversized. The chunky, striped and intarsia knits the brand is famous for are designed with significant volume. I'd always go true to your EU size here, or even size down if you want something approaching a fitted silhouette. Size up and you risk looking genuinely swamped.
Tailored Trousers & Cigarette Pants: Marni's tailoring cuts quite slim through the leg. The waist band can also be narrow-cut for Italian proportions. If you're fuller in the hip or thigh, I'd size up one and consider the waist adjusted by a tailor. Worth it — Marni trousers are exceptional.
Coats & Outerwear: Marni outerwear is where the brand truly commits to an oversized vision. These are statement coats designed with volume and theatre in mind. Go true to your EU size — the extra room is by design, not error. I once tried to size down in a Marni coat to look "more fitted" and ended up looking like I was wearing a structured bin bag. Lesson learnt.
Tops & Shirts: A mixed bag. The poplin shirts run roomy; the more fitted ribbed tops run small. Check the product fit notes and, if in doubt, go up one size.
Jeans & Denim: Marni's denim sits slim to straight across most styles. The waist-to-hip ratio works well for those with a more straight-up-and-down frame. If you have a pronounced hip curve, size up one and belt at the waist — it still looks brilliant.
Bags & Shoes: Marni shoes run true to European sizing. The bags — particularly the cult Trunk bag and the Museo tote — are a safe buy. Go with your heart.

How to Style Marni — An Honest Stylist's View

Marni rewards confidence. It's not a brand for those who want to blend in, and its sizing quirks are really just an extension of that philosophy — the clothes have opinions, and they'll make their presence known.

The key to making Marni work is proportion balancing. If you're in a voluminous Marni knit or oversized coat, pair it with something streamlined below — slim trousers, straight-leg jeans, or a fitted midi skirt. Marni's own trousers are actually perfect partners for its tops, because the brand designs them to work together. This sounds obvious, but I've seen people pair a Marni tent dress with wide-leg trousers and look genuinely baffled when it doesn't work.

The brand is also one of the rare luxury labels that actually works brilliantly with high street pieces. A Marni knit over a simple pair of COS straight-leg trousers, or a Marni bag thrown over a Massimo Dutti trench — that combination looks considered and expensive without trying.

Best Alternatives to Marni at Every Budget

Marni's full-price luxury positioning puts it out of reach for most wardrobes on a regular basis. Here's where I'd direct you for the aesthetic at every price point:

High Street:

COS — The single closest high street approximation of Marni's architectural minimalism. Oversized proportions, unusual cuts, restrained colour palette. If you love Marni's quieter moments, COS is essential.
Massimo Dutti — Brings an understated Iberian quality to tailoring and outerwear that sits beautifully alongside Marni pieces. Strong on well-cut coats and precision trousers.
Anthropologie — When Marni goes into its more eclectic, print-led territory, Anthropologie captures some of that energy brilliantly. Good for artistic dresses and interesting knitwear at a fraction of the price.
All Saints — For the edgier, darker side of Marni's palette. All Saints does interesting structural leather and suede pieces that feel grown-up and intentional.
Urban Outfitters — A surprisingly good source for the quirkier, more playful side of Marni's aesthetic, particularly its printed co-ords and relaxed knitwear styles.
Jigsaw — Understated and extremely well cut. Jigsaw's tailoring and outerwear is seriously good value and shares Marni's commitment to interesting fabric and quiet confidence.
Max Mara — If Marni's Italian tailoring and outerwear is what draws you in, Max Mara is arguably the finest high street approximation of that luxury Italian coat aesthetic you can find. The camel coat is iconic for a reason.

Premium:

Hobbs — For those who love Marni's precision tailoring but want more accessible sizing and a cleaner fit. Excellent quality occasionwear and workwear.
Banana Republic — Hugely underrated for quality tailored pieces with interesting proportions. Good on oversized blazers and wide-leg trousers at a premium-but-not-luxury price point.

Independent & Left-Field Picks:

Rejina Pyo — A London-based, Korean-born designer whose work is practically spiritual kin to Marni. Architectural silhouettes, clashing but considered colours, beautifully made. If you love Marni and want to discover something slightly more under-the-radar, Rejina Pyo is your next obsession. Sizing is standard EU and well documented.
Stine Goya — A Danish independent label that does bold print, oversized knitwear and playful volume with extraordinary skill. The artistic spirit is very Marni-coded, the price point is significantly more accessible, and the prints are genuinely some of the best in contemporary fashion.

Crack Marni Sizing Once and For All — Use Tellar

Marni's blend of intentional oversizing and true-to-size tailoring makes it one of the trickier brands to buy online. Tellar.co.uk is the UK's leading clothing size tool — it matches your exact body measurements to over 1,500 brands instantly, so you know your precise size before you click buy.

Measure once — bust, waist, hips, or use an existing brand size you already trust
Use the Store Size Lookup to get your exact size in Marni, COS, Reiss, Arket & hundreds more luxury and high street brands
Always free — no app, no download, works in-browser instantly

The Tellar Fashion Hub is also home to a growing library of free, honest, stylist-written posts covering every brand, every sizing question, every style dilemma. Unsponsored. Unbiased. Always free.