What Is Sizing Like at Isabel Marant Étoile? Your Honest Guide Before You Buy

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

Isabel Marant Étoile runs small — typically one to two sizes smaller than standard UK sizing — and if you're hovering between sizes, the near-universal advice (mine included, after a very expensive lesson with a pair of linen trousers that refused to do up) is to size up. It's a brand I genuinely love, but it demands a little know-how before you hit checkout.

First Things First: Étoile vs Isabel Marant Mainline

Quick clarification, because this trips people up constantly. Isabel Marant Étoile is the diffusion line — slightly more relaxed, more casual, and considerably kinder on the purse. The mainline Isabel Marant label is the full luxury offering. Étoile is where most of us live, and it shares the same French sizing system as the mainline but with slightly more relaxed cuts overall. That said, "relaxed" in Étoile terms still means fitted through the waist and hips on many styles, so don't be lulled into a false sense of security.

Understanding the French Sizing System

Étoile uses French sizing, which runs roughly two sizes above UK sizing.

As a guide — I'm a UK 10 and I almost always buy a French 40 at Étoile. The 38 will sometimes work on tops if the style is intentionally oversized, but on anything structured or fitted, it's a squeeze I've learned not to attempt.

Sizing by Garment Type

The brand doesn't size consistently across categories, so here's what I've found works — both from personal experience and from talking to clients who are loyal Étoile shoppers.

Tops & Blouses

Generally run one size small. If the style is boxy or voluminous (many of the printed peasant blouses, for example), you may be fine in your usual size.
The shoulder seam tends to sit slightly narrow, which can pull on broader shoulders — size up if you're wider across the back.
I had a beautiful broderie anglaise blouse from the SS23 collection that was labelled a 38 and sat like a tight 8 on me. Lesson learned.

Dresses

Maxi and midi dresses in floaty fabrics often have more ease built in — these are sometimes true-to-size or even run slightly generous.
Shirt dresses and more structured mini styles: size up without hesitation.
If a dress has a tie waist or elasticated section, you'll generally have more flexibility.

Jeans & Trousers

This is where the sizing becomes most unforgiving. Étoile denim runs small and narrow — particularly in the thigh and hip.
The brand typically cuts for a slimmer, straighter silhouette. If you have curves at the hip, go up a full size, possibly two.
Linen and cotton trousers can have a little more give, but I'd still advise sizing up on anything with a set waistband.

Knitwear

Étoile knitwear is one area where the sizing feels more generous — it's often designed to be worn loose and relaxed.
Your standard size is usually fine here, though if you prefer an oversized look, stick to your usual size rather than going up.

Coats & Jackets

Outerwear tends to have the most room. You can often stay in your usual size, especially if you want to layer underneath.
The leather and suede styles run more fitted — size up for these.

My Honest Advice: Don't Guess, Measure

Here's the thing with Étoile — the pieces are expensive enough that getting the size wrong really stings, particularly if you're buying online or in the sale. I always tell clients to measure their bust, waist, and hips before ordering anything from French brands, and then cross-reference against the specific style's measurements rather than assuming a standard French 38 will fit the same across every piece in the range. It won't. I've seen the same size label fit entirely differently on two dresses from the same season.

Fit varies most noticeably between the structured pieces (blouses, tailored trousers) and the relaxed bohemian styles (flowing skirts, draped tops). If you're new to the brand, start with something forgiving — a tiered skirt or an oversized knit — before committing to fitted denim.

The Étoile Aesthetic: Who Is It For?

If you've not shopped it before, Isabel Marant Étoile has a very specific mood — effortlessly French, with Parisian-boho energy, lots of beautiful textiles, embroidery, and that slightly undone quality that looks incredibly expensive. It suits women who want to look polished but not overdone. The sizing means it can feel exclusive in a frustrating way, but once you know your size in the brand, it becomes far less daunting. I have a few Étoile pieces that are absolute wardrobe pillars — a linen shirt I've worn for five years and a printed midi skirt that earns a compliment every single time.

High Street Alternatives Worth Knowing

Not ready to commit to Étoile prices, or want to build a similar aesthetic at lower cost? These are my picks — chosen because they genuinely reflect the same Parisian-boho energy and, crucially, tend to be more accommodating on sizing:

Mango — The closest high street match to the Étoile aesthetic. Their linen and embroidered ranges are consistently strong, and they size more generously than Étoile.
Anthropologie — Beautiful prints, bohemian styling, and a broad size range. The quality has really improved in recent seasons.
Zara — For the more structured Étoile pieces — the tailored shirts, the wide-leg trousers — Zara often nails the silhouette at a fraction of the price.
All Saints — If you love the Étoile leather and suede jacket aesthetic, All Saints is an excellent entry point. The quality is genuinely good.
Urban Outfitters — Underrated for boho-leaning pieces, especially their dresses and skirts. Worth a browse.
Whistles — For the more pared-back, sophisticated Étoile looks — the clean blouses, the smart trousers — Whistles delivers with proper fit consistency.
Cos — The architectural, understated side of Étoile's aesthetic is very well served by COS. Great for anyone who wants the French minimalism without the fuss.

Two Independent Picks

Rouje — Jeanne Damas's Paris-based label is the spiritual sibling of Isabel Marant Étoile. Flirty florals, feminine cuts, deeply French. Stunning pieces.
Musier Paris — Another Parisian brand that feels like it lives in the same world as Étoile but with a slightly younger, sportier edge. Their knitwear and denim are excellent, and the sizing is far less punishing.

Premium & Luxury Alternatives

Sandro — Premium French brand with a similar DNA. Beautifully made, Parisian, and the sizing is more predictable.
Ba&sh — Feminine, playful, with great quality. Often a better size fit for UK women than Étoile, and slightly less expensive.
A.P.C. — For the cleaner, more minimal Étoile looks. Extraordinary quality and a brand that genuinely rewards repeat buying.
Isabel Marant mainline — If you love Étoile, the mainline is the next step. Same sizing rules apply, arguably more so — and the craftsmanship is exceptional.

Find Your Perfect Size at Isabel Marant Étoile — Use Tellar

Given how much Étoile sizing varies by style and category, the smartest thing you can do before buying is use Tellar.co.uk — the UK's leading free clothing sizing tool. Enter your measurements once, and Tellar instantly matches your body to the right size across 1,500+ brands. No more guesswork, no more expensive returns.

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