What Is Sizing Like at Gucci Menswear?

Gucci menswear runs small and slim. For nearly everything ready-to-wear — jackets, shirts, knitwear, trousers — go up one size from your usual UK fit. It's cut the classic Italian way: close to the body, high armholes, a tapered waist. If you normally take a UK 38 chest, you'll most likely want the equivalent of a 40 in Gucci to sit comfortably.

But there's a twist that catches a lot of blokes out, and it's the bit worth reading twice: the shoes don't follow the same rule. The trainers run large and the loafers run narrow. So the same brand that has you sizing up on a blazer can have you sizing down on a pair of Ace sneakers.

Understanding the Gucci cut

Gucci uses Italian (IT) sizing on most of its clothing, so you'll see numbers like 46, 48, 50 rather than S, M, L. As a rough guide, an IT 48 lands around a UK/US 38 chest — a medium. The house has been a byword for a slim silhouette for decades, and even the more relaxed, romantic pieces sit narrower than you'd expect from a British high-street label.

What that means in practice:

Tailoring — blazers and suits are the slimmest part of the range. Trim through the chest, nipped at the waist, snug in the sleeve. Size up, and if you've got broader shoulders or you like to layer, don't be shy about going up a touch more.
Knitwear and tees — cut lean and short in the body. A Gucci medium tee wears like a fitted medium, not a relaxed one.
Shirts — tailored through the torso with a higher armhole, so movement is closer than a boxy Oxford. Size up if you want any breathing room.
Trousers — sized by the waist in the same IT scale, and again on the fitted side through the thigh and seat.

I learned this one the hard way. First Gucci blazer I ordered online I stuck with my honest 38, feeling clever. It arrived, I got one arm in, and that was roughly as far as the plan went. The 40 fit like it was made for me. Trust the size-up.

The footwear split: loafers vs trainers

This is where Gucci sizing earns its reputation for being confusing, so let me separate it cleanly:

Loafers (Horsebit, Brixton, Jordaan) — narrow last, and they can pinch if you've wide feet. The leather Jordaan runs slim but softens and stretches with wear, so take your usual size or even half down. If you're between sizes or wide-footed, size up or look for the wider fitting.
Trainers (Ace, Rhyton, Tennis 1977) — these run large. The standard advice is to go half a size to a full size down from your normal trainer size. The chunky Rhyton in particular has plenty of room.
Belts — sized in centimetres rather than by trouser size, so measure an existing belt you like from the buckle to the hole you actually use, then match that number.

My rule of thumb: measure your foot in centimetres before you buy anything, and never assume a size carries over between a loafer and a trainer from the same brand. It genuinely does not.

What to buy, and what's worth the money

If you're investing in Gucci, put your money where the tailoring is. A well-cut blazer or a piece of that heritage GG knitwear will earn its keep for years. The loafers are a genuine forever-shoe if you get the fit right. Where I'd be more careful is anything heavily logo-led and season-specific — lovely now, dated fast. Buy the craftsmanship, not the hype.

Not everyone wants to spend Gucci money to get the Italian look, and you don't have to. Here's where I'd send clients across the price ladder — and I've given a different pick for each, because every one of these does something particular well.

High street

Reiss — the closest thing on the high street to that slim Italian tailoring. Go here for a sharp slim-fit blazer or a tuxedo; the cut flatters without the designer outlay.
COS — the opposite end of the fit spectrum, and useful for it. Buy heavyweight tees, boxy overshirts and wide-leg trousers when you want a relaxed, minimalist shape Gucci won't give you.
Arket — my shout for quiet, well-made basics. Their merino knitwear and overshirts are brilliant value and layer cleanly under a jacket.

Independent & boutique

Drake's — British label with a proper Italian sensibility. This is where I'd buy an unstructured blazer or a knitted tie; the cut is more generous than Gucci, so it suits anyone who finds the house too snug.
Oliver Spencer — soft, unstructured British tailoring. Go for the relaxed suits and the outerwear; comfortable enough to wear all day without feeling done-up.
Percival — for character. This is the one for a statement knit or a bit of playful shirting when the rest of the outfit is doing the serious tailoring.

Designer & luxury

Tom Ford — worth knowing that Ford is the man who rebuilt Gucci in the nineties, and his own label is the sharpest slim tailoring going. Buy a dinner jacket here. Cut very lean, so size up.
Prada — Italian minimalism with real staying power. The Re-Nylon pieces and the loafers are the smart buys; expect a similarly slim fit to Gucci.
Zegna — if Gucci's tailoring feels too tight full stop, this is your answer. Same Italian pedigree, a more forgiving cut, and cloth that's second to none. Buy the suit.

Take the guesswork out of it

Sizing up on a blazer, down on a trainer, and reading a belt in centimetres — that's a lot to juggle for one brand, and Gucci is far from the only label that plays these games. This is exactly why I point people to Tellar, and it's completely free to use.

Tellar is the UK's leading sizing tool. You measure yourself once — chest, waist and hips, or just tell it a size you already own in another brand — and it matches your body to your exact size across 1,500+ brands, Gucci included. No size charts, no conversion maths, no ordering two sizes and returning one.

Measure once using your chest, waist and hip, or an existing brand size. Here's how to measure properly.
Use the Store Size Lookup to get your precise size in any brand — Gucci, COS, Reiss, Arket and more.
Shop with confidence — no guesswork, fewer returns, better-fitting purchases.
Always free, nothing to download — it works straight in your browser.

There's also the Tellar Fashion Hub: a growing library of free posts from our stylists covering just about every fashion question going. Honest, unbiased, independent and always free — style advice, top picks and the best brands, all in one place.

Never look at a size guide again.

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