What Is Sizing Like at Twinset? An Honest Guide to Getting It Right First Time

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

Twinset runs small — most UK women will need to go up at least one full size, and sometimes two, compared to their usual UK sizing. It's one of those brands where ignoring that advice will cost you a return, so let's get into exactly what you can expect before you buy.

I've had a proper love affair with Twinset over the years. There's something about that Italian femininity — the lace trims, the soft knitwear, the little touches of detail you don't find on the high street — that just gets me every time. But I've also made the rookie mistake of ordering my usual size in a rush, only to spend a frustrated ten minutes trying to get a cardigan over my shoulders. So, trust me on this one: size up.

Understanding Twinset's Sizing System

Twinset is an Italian brand, and like most Italian labels, it uses Italian/European sizing, which runs noticeably smaller than UK sizing. The brand caters to a slim, continental silhouette, and the cuts tend to be close to the body — particularly on their knitwear, blouses, and fitted dresses.

As a general rule, Italian sizing runs approximately one to two sizes smaller than UK sizing. So if you're a UK 12, you'll likely want to reach for a Twinset 44. Below is a straightforward size conversion table to take the guesswork out of it.

Twinset Size Conversion Table

Italian (Twinset) SizeUK SizeUS SizeEU Size36623438843640106384212840441410424616124448181446

My tip: When in doubt between two sizes, always go for the larger one at Twinset. The fabric quality is generally good enough that a slightly relaxed fit will still look intentional and beautiful — whereas too small just looks uncomfortable, and with fitted knitwear especially, there's no hiding it.

How Sizing Works Across Twinset's Key Categories

Knitwear & Cardigans

This is where Twinset really shines — and where sizing trips people up the most. Their knitwear is cut slim through the body and the arms. I'd recommend sizing up by one full size here as a minimum. If you're between sizes or have broader shoulders, go up two. The ribbed and fitted styles in particular leave very little wiggle room.

Dresses

Twinset dresses — especially the lace-trimmed and bodycon styles — are cut for a slim, narrow frame. Size up by one. If you carry more volume through the hips than the bust, base your size on your hip measurement, as the skirt sections tend to be the tightest part of their more fitted dresses.

Blouses & Tops

These tend to sit slightly more generously than the knitwear, but I'd still recommend sizing up one. Their silk and lace-detailed blouses in particular are not cut with a looser, relaxed fit in mind — they're designed to skim the body. If you're a UK 10 with a fuller bust, go straight to a 42.

Trousers & Skirts

Again, size up. Their trousers are cut with a slim-to-straight leg in mind and have limited stretch. I once convinced myself my usual size would work fine in a pair of their tailored trousers. Reader, it did not. Size up, and if you have curvier hips, go up two sizes and have the waistband taken in if needed — the leg and seat fit is worth it.

Outerwear & Jackets

Allow for that extra layer underneath. Twinset coats and jackets are typically structured and not oversized in their cut, so if you're planning to layer knitwear underneath (which, being an Italian brand, they absolutely expect you to), size up by one or even two depending on how much you like to layer.

Is Twinset Worth the Investment?

Honestly? Yes — if Italian feminine dressing is your thing. The quality of the fabrics, the detailing, and the longevity of the pieces is genuinely above average. These are clothes that don't feel disposable. But at the price point Twinset commands, getting the sizing right before you buy is non-negotiable. A good rule of thumb is: measure yourself properly, compare against their size guide, and when in doubt, size up.

Best High Street Alternatives to Twinset

Not ready to commit to the Twinset price tag, or just want more options with a similar feminine, elevated aesthetic? These brands all deliver in their own ways:

Jigsaw — beautifully made, understated elegance with a similar commitment to quality fabric. Sizing is far more straightforward for UK women, running true to size.
Whistles — reliably well-cut and feminine without being over-the-top. Their knitwear in particular has a lovely weight to it, and their sizing is consistent and true to UK standard.
Me&Em — a brilliant alternative for refined, polished pieces. The quality punches well above what you'd expect for the price, and the sizing is honest and consistent.
Reiss — for that slightly more structured, tailored approach with excellent fabric quality. Sizing runs true to UK, making it easier to shop online with confidence.
Mint Velvet — great for relaxed feminine dressing with lovely print work. Sizing tends to be generous and consistent, which makes a nice change after the Twinset experience.
Phase Eight — particularly good for occasion dressing with a feminine flair. Sizing is true to UK standard and they offer a wider size range than Twinset.
Massimo Dutti — the closest high street match to that polished Italian aesthetic. Sizing does run slightly continental, so worth checking their guide, but it's far more accessible than Twinset's.
Hobbs — understated, well-made, and reliably sized. A brilliant British alternative when you want quality and femininity without sizing headaches.

Two Independent Brands Worth Knowing

Sandro Paris — a Parisian label with that same effortless feminine energy as Twinset, but with slightly more relaxed French proportions. Beautifully made and genuinely worth the investment. Their sizing uses French/EU sizing, so check carefully, but they tend to run truer to size than Italian labels.
Kitri Studio — a brilliant London-based independent brand with a strong print aesthetic and feminine silhouettes. Their sizing is very clear on the website and runs true to UK sizing. Ethically produced, joyful, and genuinely original. One for when you want something nobody else is wearing.

Never Get Sizing Wrong Again — Use Tellar

Twinset's Italian sizing is exactly the kind of thing that catches people out — and it's why Tellar.co.uk exists. It's the UK's leading sizing tool, matching your exact measurements to 1,500+ brands instantly.

Measure once — bust, waist, hips, or use an existing brand size you trust.
Use the Store Size Lookup tool to get your precise size in any brand — Twinset, COS, Reiss, Arket, and hundreds more.
Always free — no app download, no account needed. Works instantly in your browser.

Plus, explore the Tellar Fashion Hub — a library of free, honest, unsponsored posts from our team of stylists. Style advice, brand guides, size breakdowns — all independent, all free.