What is Sizing Like at Loulou de Saison?

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

Loulou de Saison runs on French sizing, which means you will typically need to size up by one size compared to what you'd usually buy on the UK high street. A UK 10 will usually find that a Medium (EU 38) fits best, but the brand's silhouettes are designed with a slightly narrower, more structured cut than many of us are used to — so if you're between sizes or carry any width across the shoulders or chest, going up one is almost always the right call.

I'll be straight with you: Loulou de Saison is one of those brands I've quietly been obsessed with for a while. It has that very particular kind of Parisian energy — understated, effortless, never try-hard. Founded in 2019 by Chloé Harrouche, it's still relatively under the radar in the UK, which is part of why I love it. The pieces show up in my feeds via Net-a-Porter and Ssense, and every single time I think — yes, that's exactly what I'd wear every day. It's got a very "I just threw this on" quality that actually takes rather a lot of careful designing to pull off.

The Official Loulou de Saison Size Guide

The brand uses a French/EU size system, which they label as XS through XL internationally. Here's how it translates:

Loulou LabelEU / FRUKUSITDenim (waist)XS344–60–23824–25S36844025–26M381064227–28L401284429–30XL4214104631–32

The brand's fit model is 5'9" (175cm) and wears a size S — so the proportions are cut for a longer frame. If you're petite (under 5'4"), it's worth noting that some of the longer-line pieces like midi skirts and wide-leg trousers may need a hem. Personally, I'm always mentally adjusting for trouser length when I look at French labels, and Loulou de Saison is no exception.

How Does the Fit Feel in Practice?

This is where French brand sizing gets a bit nuanced, and I want to be really clear rather than vague about it. Loulou de Saison clothes are cut with a Continental silhouette — that means slightly narrower across the shoulders and chest, less ease through the body than the average UK high street piece. It's not restrictive exactly, more... precise.

Knitwear & sweaters: The cashmere and wool blends are the brand's heartland — they run true to their French sizing but with a relaxed, slightly boxy drape. If you love an oversized look, go true to size. If you prefer a more fitted look, you might actually go down. This is one of the few categories where I wouldn't automatically size up.
Dresses & skirts: Size up one from your usual UK size. The waist and hip measurements tend to run narrower than you'd expect. A UK 12 shopping here should be in an L. The silhouettes are often column or bias-cut, so fit through the hip matters.
Trousers & tailoring: Definitely size up. The cut is structured and Parisian — beautiful, but unforgiving if you're between sizes. The wide-leg styles are more forgiving, but anything more tailored will feel tight if you go by your standard UK size.
Tops & blouses: I'd go by bust measurement more than UK size label here. If you're a fuller bust, size up without hesitation. The cut through the shoulder and chest is where you'll feel the difference most.
Outerwear & coats: The wool coats have had a real moment (rightly so — I've seen the sold-out messages far too many times). They're often more relaxed in cut than the RTW pieces, but still size up if you plan to layer underneath, which in a British winter, you absolutely will.
Denim: Refer to the waist measurement guide above rather than your usual UK jeans size. French denim tends to be cut more narrowly through the thigh, so if you carry any volume there, size up.

My Honest Sizing Verdict

My rule for Loulou de Saison: think of yourself as one size larger than you usually are on the UK high street, and you'll be in the right ballpark. A UK 8 = S, a UK 10 = M, a UK 12 = L. The only exception is the knitwear, which is more lenient. If you're on the border between two sizes, always go up — you can always style a slightly oversized piece, but nothing is worse than a beautiful French blouse that gapes across the chest (I have made this exact mistake with another French label and I still think about it).

The brand is available online at Net-a-Porter, Ssense, Farfetch, and The Outnet, all of which have good return policies — which helps enormously when you're navigating French sizing from the UK. Buy two sizes if you're unsure and send back what doesn't work. It's what I always recommend when a brand's sizing deviates significantly from UK norms.

Style Notes: What's Worth Buying at Loulou de Saison?

If I'm pointing you towards specific pieces, the knitwear is genuinely exceptional. The cashmere-wool blend sweaters photograph beautifully but also just feel incredible to wear — the kind of thing you reach for constantly once it's in your wardrobe. The column skirts have been a hit with style editors for good reason — they're versatile, very wearable, and nail that Parisian minimalism without looking like you're trying too hard. The outerwear, particularly the long wool coats, is investment-level quality and worth every penny.

Looking for Alternatives? Similar Brands to Explore

Loulou de Saison sits at the premium end of contemporary — so if you love the aesthetic but want to shop across a wider range of budgets, here's where I'd point you:

High Street Picks

Cos — the closest high street equivalent in terms of minimalist, architectural design and neutral palette. Their sizing is also European-leaning, so similar rules apply.
Massimo Dutti — excellent tailoring and knitwear with a Spanish-European precision that feels aligned with Loulou de Saison's ethos. Great for trousers and coats.
Whistles — a reliable British option for clean, grown-up dressing. Fits more generously than Loulou, so a good option if you find French sizing frustrating.
Mango — consistently under-credited for its quality staples. The Committed collection in particular has produced some brilliant minimal pieces season after season.
Jigsaw — British but with a very European sensibility. Lovely fabric quality, especially for knitwear and outerwear.
Me&Em — a real step up from the standard high street. The pieces are considered and well-made, and they size more generously, which many will find a relief.
Claudie Pierlot — actually a French brand, so gives you that same Parisian feeling at a slightly lower price point. Sizing runs equally narrow, so the same rules apply.

Premium & Designer

Totême — Swedish, but shares Loulou de Saison's love of quiet luxury, clean lines and elevated basics. A frequent companion piece in the wardrobes of women who love both labels.
The Row — for those for whom budget is less of a concern. The Row is the gold standard of this kind of understated, impeccable dressing.

Independent & Under-the-Radar Picks

Rouje — founded by Jeanne Damas in Paris, this genuinely indie French label has a slightly more romantic take on French minimalism than Loulou de Saison but shares the same spirit. Very much one for the Pinterest-aesthetic crowd, in the best way.
Baserange — a Copenhagen-based indie with an incredibly strong identity around natural fabrics and minimal, body-aware design. If you love Loulou de Saison's knitwear, you will love Baserange. Harder to find in the UK but very much worth hunting down.

Never Get Your Size Wrong Again — Try Tellar

Shopping a brand with French sizing from the UK is exactly the kind of situation Tellar was built for. It's the UK's leading clothing size tool — match your exact measurements to 1,500+ brands instantly, so you know your precise size before you click buy. No more guessing, no more returns.

📏 Measure once — bust, waist, hip, or use an existing brand size you already know
🛍️ Use the Store Size Lookup to get your precise size in any brand — Loulou de Saison, COS, Totême, Reiss & 1,500+ more
✅ Always free — no downloads, works straight in your browser

Plus, the Tellar Fashion Hub is a library of free, honest, unsponsored posts covering every fashion question you've ever had. Real advice. No affiliate bias. No brand deals influencing the editorial.

Visit Tellar Find My Size Now