What Is Sizing Like at Y.A.S? A Stylist's Honest Take

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

Y.A.S sizing is generally true to size — go with your standard UK size and you will almost certainly be right. That said, there are a handful of garment-specific quirks worth knowing before you hit checkout, which I'll walk you through below.

My First Encounter With Y.A.S

I first picked up a Y.A.S dress at a John Lewis concession — one of those floral midi numbers that looks almost too pretty to be on a mid-price rail. I went in my usual 10, it slipped on beautifully, and I didn't think about it much further. Job done. But then a client came to me frustrated: she'd ordered a tailored Y.A.S blazer in her usual size and found the shoulders uncomfortably tight. Turns out, the brand's more structured pieces behave a little differently to their floaty dresses. I've been paying much closer attention ever since.

Y.A.S Size Guide — UK, EU & US ConversionHow Y.A.S Sizing Breaks Down by Garment

The brand is rooted in contemporary Scandinavian design — clean lines, flattering cuts, occasion-ready silhouettes. The sizing reflects that aesthetic: lean, polished, with a quietly confident fit. Here's what I've found garment by garment:

Dresses & midis — These are where Y.A.S really shines. Wrap styles, floral midis and slip dresses all run true to size with a forgiving, flattering drape. Stick to your usual size with confidence.
Blazers & tailored jackets — These can feel slightly snug across the shoulders and waist, particularly if you carry width across the back. If you're between sizes here, I'd size up. It's far easier to have a blazer taken in at the waist than to deal with pulling seams.
Trousers & co-ords — Waist sizing is fairly firm with very little stretch. Measure your waist before ordering. If you're a 12 on top and a 14 on the bottom, buy the 14 and get the waist nipped in — it's a £10 tailor job and the result is perfect.
Knitwear — Relaxed and slightly generous, especially in oversized or slouchy silhouettes. Your usual size works, but if you prefer a crisper, more structured knit fit, you could size down by one.
Occasionwear — Often cut for a slimmer, more streamlined silhouette at the hip and thigh. Don't be tempted to squeeze into your usual size; trust your hip measurement here.
Jumpsuits — Multiple customers and reviewers note these fit well, but consider your height. The standard inseam is on the longer side, so if you're petite, go for ankle-length styles or be prepared to hem.

Who Y.A.S Sizing Works Well For

In my experience, Y.A.S fits consistently well for women with a fairly standard proportional frame — balanced bust, waist and hips. The Scandinavian cut is elegant but not overly boxy, which means it tends to suit a straight or pear-shaped figure beautifully. If you have a fuller bust relative to your waist, watch the dress sizing — some styles have less ease across the chest than you might expect at a UK 10 or 12.

Petite women may find the dress hems land longer than expected (the brand doesn't seem to offer a dedicated petite range), while taller women will likely appreciate the longer inseam options. Plus-size coverage goes up to an XL/EU 42, which is a UK 14 — the range is more limited at the upper end than brands like Mango or ASOS, so do check availability in your size before falling in love with a piece.

High Street Brands With Similar Sizing to Y.A.S

If you like Y.A.S but want a wider size range or faster delivery, these brands offer a comparable fit and aesthetic. I've handpicked these based on style alignment, not just availability:

Cos — Scandi-adjacent, clean lines, true-to-size tailoring. Almost a Y.A.S sister brand in ethos.
Mango — Great for occasion dresses and blazers in a similar cut; tends to run true to size with slightly more stretch in their woven fabrics.
Whistles — Shares Y.A.S's love of refined, feminine pieces. Sizing is consistent and true-to-size across most categories.
Reiss — A step up in price but the tailoring is exceptional. Fits very similarly to Y.A.S blazers, with that same lean, European shoulder line.
Me&Em — Brilliant for polished everyday pieces; sizing is consistent and generous enough to suit a wider range of body shapes.
Phase Eight — If you're shopping Y.A.S for occasion dresses, Phase Eight is a natural alternative with a slightly more generous cut across the hip.
Hobbs — Smart, structured pieces with reliable true-to-size tailoring. Good for workwear alternatives to Y.A.S's blazers and trousers.

Independent picks I love:

Birdsong — A London-based ethical brand making beautifully cut dresses and separates in extended sizes. Refreshingly honest about their fit, and worth knowing about.
Saywood — A UK slow-fashion label doing colourful, bold midi dresses that sit in a similar style zone to Y.A.S occasion wear. Sizing is generous and well-labelled.

Premium & luxury alternatives: Max Mara (for elevated blazers and coats), Claudie Pierlot (French femininity with Scandi structure) and Ted Baker (occasion dressing with a more overtly romantic, fitted cut).

My Verdict on Y.A.S Sizing

For dresses and knitwear, just go with your usual UK size — you'll almost certainly be happy. For structured pieces, blazers and tailored trousers, take two minutes to measure your bust and waist against the chart above before ordering. It could save you a return. The brand is genuinely good quality for the price point, and the Trustpilot reviews back that up: customers consistently say pieces look even better in person than on the website. I'd agree.

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