What Is Sizing Like at Thom Browne Menswear?

Thom Browne runs small, and it doesn't use standard S/M/L sizing at all. The brand works on its own numeric scale — 0, 1, 2, 3 and 4 — and each number tracks roughly to a chest measurement. On top of that, nearly everything is cut deliberately cropped and close to the body. So if you order your "usual" size expecting a normal fit, there's a very real chance it'll arrive looking like it belongs to your younger, smaller brother.

How Thom Browne's numbers actually work

The numeric system throws people, but it's simpler than it looks. As a working rule, the size number lines up with your chest in inches like this:

Size 0 — roughly a 34" chest (think XS)
Size 1 — roughly a 36" chest (S)
Size 2 — roughly a 38" chest (M)
Size 3 — roughly a 40" chest (L)
Size 4 — roughly a 42" chest (XL)

So a man who normally wears a 38" chest medium is technically a size 2. The catch is that "technically" and "how you'll want it to feel" are two different things at this brand — which brings us to the fit itself.

The fit, garment by garment

The shrunken silhouette is the whole point of Thom Browne. Short jackets, high armholes, cropped hems and slim sleeves aren't a mistake — that's the house look, borrowed from mid-century Ivy League tailoring and then tightened right up. Here's how it plays out across the range:

Suiting & blazers: Cut short and narrow with high armholes and a nipped waist. Beautiful on a slim frame, tight across the chest and shoulders on everyone else. Broad or muscular? Go up a size, and get the trousers looked at by a tailor.
Shirts: The slimmest thing in the collection. Shorter sleeves and a trim body are standard. If you like room to move, size up — most men do.
Knitwear & sweatshirts: Designed to sit cropped and boxy. A size 2 jumper won't drape like your usual medium; it'll finish higher and hug more. That's intentional, not shrinkage.
Trousers: Slim through the leg with the brand's signature exposed, cropped ankle. Fine if you want that look — worth lengthening if you don't.
Footwear: The most forgiving category. Broadly true to size, though brogues and loafers run a touch narrow, so allow for that if you've a wider foot.

My honest steer: if you're buying Thom Browne to actually wear day to day rather than to nail the exact runway proportion, size up by one. If you're tall, broad, or simply prefer a relaxed line, don't be shy about going up two. It's the single most common Thom Browne regret I get asked to fix.

A quick war story. Years back I talked a groom into a Thom Browne two-piece for his wedding and, in a rush before the shop shut, we ordered his "size 2" without trying the jacket on properly. It turned up with the sleeves ending an inch above where he wanted and no give across the back — sharp, yes, but he couldn't lift a champagne flute without the whole thing straining. We sized up to a 3, had the trousers hemmed, and it was faultless. Lesson learned: with this brand, the number on the label is a starting point, never a promise.

Where else to shop for sharp, structured tailoring

Thom Browne's price tag isn't for everyone, and you don't need it to get that clean, considered, slightly Ivy look. Here's where I send clients across three budgets — each brand earns its place for a different reason.

High street

Charles Tyrwhitt — The best-value route to a genuinely well-cut shirt and a proper city suit. Their extra-slim shirting gets you the trim Thom Browne silhouette without the eye-watering price, and the fit is far more consistent than most of the high street.
Marks & Spencer (Autograph line): Quietly one of the smartest-value tailoring buys in the UK. The Autograph suits use good cloth and a modern, tapered cut — ideal if you want structure and longevity without overthinking it.

Independent & boutique

Drake's — If Thom Browne's Ivy roots are what pull you in, this is the real, softer-shouldered version of that world. Oxford shirts, relaxed tailoring and knitwear with proper character, made by people who genuinely love the reference points.
Percival — A London label doing playful, modern British tailoring and knitwear with a nod to retro proportion. Great cropped-leaning cuts and a bit of personality, which suits anyone drawn to Thom Browne's sense of fun.

Designer & luxury

Thom Sweeney — British tailoring at its sharpest. If you want that razor-clean, close-cut line but with a more wearable, made-for-a-real-body fit than Thom Browne, this is where I'd point you.
Ami Paris — Clean French tailoring cut slightly softer and more relaxed. A brilliant counterpoint if you love the polish of Thom Browne but find the shrunken proportions a step too far.
Officine Générale — Parisian, understated and beautifully made, with an unstructured ease that flatters more body types. The grown-up choice for elevated tailoring you'll actually reach for.

Whichever way you go, the principle is the same: with structured tailoring, fit beats logo every time. A £120 suit that sits properly will always look sharper than a £2,000 one straining across the shoulders.

Find your exact Thom Browne size in seconds

Thom Browne's numeric system is exactly the sort of thing Tellar.co.uk was built to solve. It's the UK's leading sizing tool — match your body to 1,500+ brands instantly and never squint at a size guide again.

Here's how it works:

Measure once — enter your chest, waist and hip, or simply tell it a brand you already know fits you.
Use the Store Size Lookup tool to get your precise size in any brand — Thom Browne, COS, Reiss, Everlane, Arket and more.
Not sure how to measure? Our quick How to Measure guide walks you through it in a couple of minutes.
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And don't miss the Tellar Fashion Hub — a growing library of honest, unbiased, independent posts from our stylists covering every sizing and styling question going. No ads, no sponsored content. Just straight advice, always free.

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