Jacquemus Sizing: Does It Run Small? A Stylist's Honest Guide

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

Yes — Jacquemus runs small. Often significantly small. If you're a UK 12 and you breeze onto the Jacquemus website expecting your usual size, you are in for a surprise. The brand follows French sizing conventions, which typically sits one to two full sizes smaller than UK sizing. I cannot tell you how many clients have come to me baffled after ordering their usual size, only to find the zip won't budge. It's not you — it's the sizing system.

That said, Jacquemus is one of those brands I absolutely adore recommending, because when it fits? It's extraordinary. Simon Porte Jacquemus has this genius ability to make a woman feel both sculptural and effortlessly French. But getting there requires a bit of insider knowledge — which is exactly what this guide is for.

Why Does Jacquemus Run So Small?

Jacquemus is a French luxury house, and French sizing is notoriously cut closer to the body than British standards. Add to that the brand's signature aesthetic — sharp tailoring, narrow waists, body-skimming dresses and cropped, structured silhouettes — and you've got a brand that is deliberately designed to fit like a second skin. There's very little ease built in, especially in woven, non-stretch fabrics.

I had a client last season who ordered a Jacquemus blazer in her normal UK 10. It arrived looking like it had been made for a teenager. Once she exchanged it for a 12, it sat like a dream — nipped at the waist, perfect on the shoulders. That one size up made all the difference.

Jacquemus Sizing by Category

The brand isn't entirely uniform across categories, which is part of what makes it tricky. Here's how I'd break it down:

Dresses: Generally cut small and short. Form-fitting styles in particular run tight — I'd always suggest sizing up at least one size. If you're bustier or carry weight on your hips, size up two.
Blazers & Tailoring: Sculptured shoulders, narrow waists, very little stretch. Size up. If you want movement and comfort, size up two.
High-Waist Skirts: Figure-hugging with a strong silhouette. Measure your waist carefully and compare to the size chart — never guess.
Trousers: Slim-cut with high waistlines. They run tight across the hips and thighs. Little to no stretch in the woven styles.
Knitwear & Oversized Styles: Much more forgiving. Boxy cuts and dropped-shoulder knits are generally true to size or even generous. Stick to your usual size here.
Outerwear: Depends entirely on the style. Cropped jackets are snug — size up. Oversized trench coats and voluminous silhouettes are far more generous — your usual size will work.
Shoes: Broadly true to EU sizing, but Jacquemus shoes tend to run narrow. If you have a wider foot or are between sizes, go up half a size.

My Golden Rule for Shopping Jacquemus

Always, always measure before you buy. Don't rely on what you think your size is — grab a tape measure, note your bust, waist and hip measurements, and compare them directly to the Jacquemus size chart. The brand does publish sizing information, and it's worth taking five minutes to check it rather than paying return postage.

And if you're between sizes? Size up. Every single time. The brand's pieces are designed to skim and sculpt — you won't lose any of that magic by going one size larger. What you will avoid is the crushing disappointment of a beautiful dress that won't zip up.

What Are the Best Pieces to Buy?

If you're new to Jacquemus, these are the pieces I'd send my clients toward first:

The Le Chiquito bag — an iconic investment that requires zero sizing thought and adds instant French energy to any outfit.
Linen and cotton summer dresses — the brand's Provençal DNA shines here, and they're genuinely beautiful for the warmer months. Just size up.
Oversized blazers — when Jacquemus goes oversized, it goes right. These feel modern, wearable and incredibly chic.
The sculpted mini skirts — high-waist, structured, and deeply flattering when the fit is correct. Worth the effort of measuring.

High Street Alternatives to Jacquemus

Look, not everyone wants to spend £400 on a dress — and frankly, there's no reason to if the fit is going to be this complicated. Here are some brilliant alternatives that capture a similar French-inspired, tailored aesthetic without the sizing stress:

Claudie Pierlot — the most obvious spiritual sibling to Jacquemus. French brand, beautiful tailoring, similar silhouettes. Sizing runs small here too, so the same rules apply — but the pieces are stunning.
Reiss — consistently brilliant for sculpted, structured dresses and tailoring at a fraction of the price. Their sizing is far more intuitive for UK shoppers.
Me&Em — for the Jacquemus-lover who wants elevated basics with a thoughtful fit. Their linen trousers and blazers are exceptional quality and genuinely size consistently.
Jigsaw — understated, grown-up and quietly chic. Their dresses have a similar ease and elegance to Jacquemus's more relaxed summer pieces.
Whistles — brilliant for structured silhouettes, sharp tailoring and clean lines. I love their minimalist aesthetic as an everyday Jacquemus substitute.
Massimo Dutti — genuinely underrated. Their tailored trousers, blazers and dresses hit the same aesthetic note as Jacquemus at a far more accessible price. Sizing is consistent and true to UK sizes.
Anthropologie — for the more whimsical, romantic end of the Jacquemus look. Their textured mini skirts and structured dresses are gorgeous, and sizing is far more accommodating.
LK Bennett — a go-to for elegant, body-skimming occasion dresses. If you love Jacquemus for events and parties, LK Bennett will reliably deliver a beautiful fit without the guesswork.

Two Independent Brands Worth Knowing

These are my left-field picks for this one — two smaller labels that I genuinely rate:

Rouje — a Paris-based label founded by Jeanne Damas that absolutely nails the effortless French-girl aesthetic Jacquemus is famous for. The dresses are a little more relaxed in cut but equally beautiful, and the brand has a very loyal following for good reason. Sizing runs French-small, so the same advice applies — size up.
Sézane — if you love the Provence-meets-Paris aesthetic of Jacquemus, Sézane is an absolute must. Exceptional quality, beautiful fabrics, and a sizing guide that is actually helpful. I've been recommending them to my clients for years and the feedback is always glowing.

Never Get Jacquemus Sizing Wrong Again

Jacquemus sizing is genuinely one of the trickiest in luxury fashion — French conventions, body-skimming cuts and limited stretch mean even experienced shoppers get it wrong. That's exactly why Tellar.co.uk exists.

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