What Is Sizing Like at ARNE?

ARNE runs largely true to size. Most of the womenswear uses simple alpha sizing — XS to XL — so your usual size is a safe starting point. The one thing to know: a handful of the heavyweight, relaxed pieces are cut deliberately roomy, so if you want a sharper line rather than a slouchy one, you'll occasionally want to size down. That's the short answer. Now let me give you the proper stylist's breakdown, because ARNE is one of those brands where a small decision at checkout makes a big difference to how the finished look reads.

If you don't know ARNE yet, it started life as a men's label and the womenswear is the newer, fast-growing arm — built on the same quiet-luxury, less-is-more philosophy. Think heavyweight tracksuits, clean tops and easy trousers in a disciplined palette of navy, grey, stone, black and the odd warm rust. It's elevated everyday rather than fashion-forward, and the fit philosophy follows suit: comfortable, considered, nothing fussy.

So, is ARNE true to size?

For the most part, yes — and the reviews back that up, with shoppers consistently saying pieces fit well and feel premium for the price. Here's how it breaks down by category:

Tops and tees: True to size with a neat, modern cut. Take your usual size and you'll get a clean, not-clingy fit.
Heavyweight tracksuit sets: The relaxed range (that lovely dense 520gsm fabric) is designed to hold its shape rather than balloon. True to size gives you a relaxed-but-not-swamping fit — slouchy in the right way.
Between two sizes? Size down for tops and tees if you like things fitted; stay true to size if you prefer a touch of room.

The relaxed-fit catch (and when to size down)

Here's my own little ARNE lesson. I ordered the relaxed hoodie-and-jogger set in my usual medium expecting a snug, gym-ready fit — and got a gorgeously slouchy weekend set instead. Perfect for a Sunday and a long dog walk, but a touch much layered under a wool coat. For a neater silhouette I'd have gone to a small on top. So the rule I now give clients: if "relaxed" or "oversized" is in the product name, decide first whether you want cocooning or contoured, and size accordingly. There's no wrong answer — just know which look you're buying.

Good news for petite frames

ARNE has rolled out petite sizing across parts of the women's range, which is a genuine win and not something every minimalist label bothers with. If you're 5'3" or under, this matters:

The standard joggers and flared tracksuit bottoms run long — petite lengths solve the puddle-at-the-ankle problem without you having to take scissors to the hem.
Petite cuts also bring the shoulder seams and sleeve length back into proportion, so a relaxed top reads intentional rather than borrowed.

Fit notes piece by piece

Joggers and flared bottoms: True to size on the waist, generous on the leg by design. Petite if you're short; otherwise expect a long, flattering line you can wear with trainers or a heeled boot.
Knits and tops: Take your usual size for a clean drape; size down only if you want them properly close to the body.
Footwear: Order your standard size — the trainers are reported as true to fit with no need to adjust.

My honest stylist's verdict: ARNE is one of the more reliable brands to buy unseen. The sizing is consistent, the quality is well above the price point, and the only real decision is relaxed versus fitted — not "will this even go on."

Where else to shop if ARNE isn't quite your fit

If you love the elevated-basics, quiet-luxury feel but want to compare fits across the market, here's exactly where I send clients chasing the same aesthetic.

High street

Uniqlo — The benchmark for affordable minimalist basics. Wonderfully consistent sizing and the closest high-street match for ARNE's clean, fuss-free tees and joggers.
COS — Architectural, pared-back and the most design-led option here. Sizing runs slightly generous, so size down for a sharper line.
Marks & Spencer (M&S) — Dependable, true-to-size everyday pieces, and the Goodmove activewear line is a quietly brilliant tracksuit alternative.
H&M — Trend-led basics at the friendliest prices; the H&M Move loungewear is a great low-commitment way to test the heavyweight-set look.
Gap — Soft, slouchy American loungewear and joggers with a relaxed cut that mirrors ARNE's weekend energy.
Massimo Dutti — Quiet-luxury minimalism in knits and tailoring; pricier than the high street average but beautifully made and true to size.
Gymshark — If you want the athleisure end of ARNE with a more sculpted, body-conscious fit, this is your shop.

Premium

Sweaty Betty — British premium activewear with genuinely flattering technical fits; reliable sizing and beautiful loungewear beyond the gym kit.
Lululemon — The gold standard for true-to-size athleisure. The Align range in particular fits predictably and lasts for years.
The White Company — For elevated loungewear in soft neutrals — the grown-up, quiet-luxury take on the cosy ARNE set.

Luxury / designer

Max Mara — Italian luxury minimalism at its finest; the Leisure line gives you that pared-back ARNE silhouette in investment-grade fabric.
Joseph — Impeccable minimalist knitwear and trousers with a clean, elongating cut — the designer destination for less-is-more dressing.

Two independents worth knowing

Colorful Standard — A Danish label doing heavyweight organic-cotton tees and sweats in a glorious colour range. True to size, ethically made, and the closest indie cousin to ARNE's everyday basics.
Ninety Percent — A London sustainable label making elevated, minimalist everyday pieces with a softly relaxed fit and a genuine conscience. A lovely left-field find for fans of considered basics.

How Tellar takes the guesswork out

Here's the honest truth after years of styling: clothing fit consistency across UK brands is a myth. The same "size 12" can vary wildly from one label to the next, which is precisely why I built Tellar.co.uk — the UK's leading sizing tool. Match your body to 1,500+ brands instantly and never squint at a size guide again.

Measure once — using your bust, waist, hip, or simply an existing brand size you already know.
Use the Store Size Lookup tool to get your precise size in any brand — COS, Reiss, Everlane, Arket and more.
Always free, no downloads, works straight in your browser.

There's also the Tellar Fashion Hub — a library stacked with free posts from our top stylists. Honest, unbiased, independent and always free: style advice, top picks and the best brands for every body.

A few of our most-read guides to carry on with:

Know your ARNE size before you buy

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