What Is Sizing Like at Marine Serre? Your Complete Fit Guide

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

Marine Serre sizes small — often a full size down from what you'd expect — so if you're new to the brand, go up at least one size, especially in the brand's signature bodysuits and fitted dresses. It's one of those labels where ignoring the size guide genuinely costs you.

I'll be honest, the first time I ordered a Marine Serre crescent moon bodysuit, I sized with my usual instinct and thought I'd be fine. Reader, I was not fine. It arrived, beautiful and unwearable, like it had been made for a slightly smaller, more committed version of me. Lesson learned — and now I'm passing that lesson on to you so you don't have to repeat it.

How Marine Serre Sizes Its Clothing

Marine Serre is a French luxury label, and the brand uses European sizing across its collections. The cuts are intentionally body-conscious and technical — this is fashion that is designed to sit on the body, not float around it. Even the roomier silhouettes in the collection, like the patchwork coats and oversized jersey layers, assume a close relationship between garment and wearer.

The brand runs from XS (EU 34) through to XL (EU 44), with some pieces extending slightly beyond that. In UK terms, that typically translates as:

Marine Serre Size Conversion Table

Marine Serre / EU SizeUK SizeUS SizeBust (cm)Waist (cm)Hips (cm)XS / 3462806187S / 3684846591M / 38106886995L / 40128927399XL / 4214109677103XXL / 44161210081107

My advice: always cross-reference these against your actual measurements rather than going by your usual dress size. Marine Serre is not a label where you can comfortably guess.

Bodysuits & Tops — Size Up Without Question

The crescent moon bodysuit — arguably the brand's most iconic piece — is cut with zero ease. It's a second skin. If you are between sizes, go up. If you have a broader back or a fuller bust, go up two sizes. The stretch fabrics are high quality and will pull, but that pull should feel like structure, not strain.

The bodysuit is snug across the chest — expect minimal ease here
The jersey tops and long-sleeve base layers also run tight; shoulder width is especially narrow
Longer torso? Check the bodysuit length in the product description — some shorter women find it gapes slightly at the crotch on smaller sizes

Dresses & Skirts — Fitted, But Not Always Unforgiving

The dresses vary more than the tops. The more structural pieces — wrap dresses, draped asymmetric styles — give you a little more room to breathe. The bias-cut styles and mermaid silhouettes, however, mirror the bodysuit logic: size up, especially if you're carrying any volume through the hips.

Midi and maxi dresses are generally more forgiving than mini styles
Structured dresses suit a standard size-up; stretchy body-con dresses sometimes need two
Skirts, particularly the quilted and regenerated fabric styles, have more room — these tend to feel closer to a true EU fit

Outerwear & Coats — These Are More Generous

Good news here: the outerwear is noticeably more relaxed. The patchwork coats, leather jackets, and quilted bombers are generally designed to layer over the brand's own base pieces, so the cuts accommodate that. I'd still recommend checking shoulder measurements — Marine Serre's shoulders run narrow even on the bigger silhouettes.

Coats and jackets: your true EU size or even a size down works here
Check shoulder seam positioning carefully — narrow shoulders are a consistent design feature
If you're wearing a chunky knit underneath, size up once

Trousers & Leggings

The leggings and jersey trousers are cut the same way as the bodysuits — tight and deliberate. The tailored trousers, by contrast, have a more standard fit. For leggings, go up one size as a baseline. If your hips measure significantly larger than your waist, use your hip measurement as your guide.

Jersey and legging styles: size up at least once
Tailored and wide-leg trousers: closer to true EU size
Inseam length: Marine Serre cuts long — petite wearers should factor in significant hemming

Where to Shop If Marine Serre Isn't in Your Budget Right Now

Genuinely great label, genuinely steep price point. If you love the aesthetic — body-conscious, sustainable, with that cool-girl Parisian edge — here are alternatives worth exploring at different budget levels.

High Street & Accessible Brands:

COS — Clean, architectural cuts that share Marine Serre's love of interesting silhouette. Sizes consistently and slightly more generously than MS.
Mango — Brilliant for body-conscious jersey pieces at a fraction of the price. Their bodysuit and skirt combinations genuinely hold their own.
All Saints — Nails the darker, edgier end of the aesthetic. Great for jersey basics and leather-adjacent pieces.
Urban Outfitters — For the moon-print era dupe energy and experimental layering. The sizing here runs slightly more generously than Marine Serre.
Reiss — For those wanting the structured bodycon dress in a more office-friendly way. Reliable European sizing.
Zara — Their body-conscious jersey collection is genuinely good right now. Watch sizing carefully — Zara runs small on stretch pieces too.
Massimo Dutti — For the more sophisticated end: elevated basics, quality jersey, and consistent European sizing that's a little kinder than Marine Serre's.

Independent Picks:

Paloma Wool — A Spanish independent label with a similar avant-garde, body-aware aesthetic. Brilliant quality, genuinely interesting design, and their sizing notes are accurate. Worth every penny.
Baserange — Danish minimalist brand making beautiful, sustainable basics in a similar jersey-forward spirit to Marine Serre's base layers. Sizes true to EU sizing and the quality is exceptional.

Premium:

Jacquemus — Another French label with similar body-consciousness and precise sizing. The same size-up advice applies.
Isabel Marant — Slightly more generous in cut but shares that Parisian cool energy. Often a better starting point if you're new to French luxury sizing.

Luxury:

Rick Owens — For those who love the deconstructed, conceptual element of Marine Serre's work.
Balenciaga — The house that originally trained Marine Serre herself. The DNA is right there in the silhouettes.

Never Get Your Size Wrong Again — Tellar Is Free

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