How to Find Your Perfect Fit at Alaïa

BRAND SIZING GUIDE · DESIGNER

Alaïa sizes small and runs in French sizing — knowing your measurements before you shop will save you a very expensive mistake.

By Ella Blake  |  Tellar Fashion Hub

Let me be honest with you: I once stood in the Alaïa boutique on Old Bond Street holding a dress that looked like it was made for a goddess, confident I knew my size — and I was wrong. Not just slightly wrong, but two whole sizes wrong. Alaïa is one of those brands where your usual instinct will absolutely betray you, and given the price point, that is not the kind of surprise you want at the till. So let me walk you through exactly what you need to know before you shop.

The Alaïa Sizing Reality Check

Alaïa uses French sizing and, crucially, the brand runs small — sometimes considerably so. A woman who wears a UK 12 in most high street brands should expect to size up to at least a 40, possibly a 42, depending on the garment. The founder, Azzedine Alaïa himself, designed with precise body-consciousness in mind — these clothes are intended to follow your actual body, not float around it. That means the cut is unforgiving in the best possible way, but sizing up is not a defeat. It is simply the done thing.

Here is a rough conversion to get you started:

UK SizeAlaïa (FR) SizeAlaïa (IT) SizeUS SizeUK 634382UK 836404UK 1038426UK 1240448UK 14424610UK 16444812

Treat these as starting points only — the actual fit will shift depending on the category of garment you are buying and the fabrication involved.

It Varies Hugely By Category

Alaïa is not one-size-fits-all even within the brand itself. This is where things get interesting — and where a little insider knowledge genuinely pays off:

• Knitwear: The ribbed dresses and jumpers Alaïa is so famous for have some stretch, but they are still designed to sit close to the body. Go up one size from the conversion table if you have a fuller bust or broader shoulders. The stretch is there to enable movement, not to compensate for sizing down.

• Tailoring and leather: These are the most size-sensitive pieces in the range. The leather trousers and structured coats have very little give. Measure your hips and waist precisely and compare directly with Alaïa’s own size guide before you commit to anything.

• Jersey and draped pieces: These tend to have a little more flex. Still size up, but you will likely find the conversion table is closer to accurate here.

• Shoes: Alaïa shoes generally run true to size in European sizing, though if you are between sizes, go up — the lasts are fairly narrow and the fit is precise.

STYLIST’S TIP

Always take your measurements — bust, waist, and hips in centimetres — and compare them directly against Alaïa’s size chart rather than relying on your usual UK size conversion. The difference between a 38 and a 40 at Alaïa can be as little as 2cm at the waist, but it will affect the entire drape of the garment. These details matter enormously at this price point.

What to Measure and Why It Matters

For Alaïa, the three measurements that matter most are your bust, waist, and hips — in that order of importance depending on the piece. The brand’s silhouettes are built around a defined waist and generous curve, so if you are narrower on top and fuller below (the classic pear shape), size to your hip measurement and consider having the waist taken in by a good tailor. At this price point, a minor alteration is absolutely worth it for a fit that looks like it was made for you specifically.

For knitwear in particular, focus on the bust measurement. The ribbed construction means the waist will accommodate some variation, but if a knit pulls across the shoulders or gaps at the chest, no amount of clever styling will fix it.

New Season vs. Archive and Resale

One question I get regularly is whether sizing differs between current mainline pieces and vintage or resale stock. The honest answer is yes — significantly. Vintage Alaïa from the 1980s and 90s runs even smaller than the contemporary collections, because those pieces were cut to an almost couture-level of precision. If you are shopping through Vestiaire Collective, 1stDibs, or a specialist resale boutique, size up more aggressively than you would for current-season pieces, and base your decision on the listed measurements rather than the tagged size. The tag is almost meaningless on archive pieces.

For current season, Net-a-Porter and Mytheresa both carry Alaïa with solid size guidance and helpful customer service if you want to confirm fit before purchasing. Both have good return policies, which matters when you are shopping a brand this precise. The Alaïa boutiques themselves (London, Paris, New York) have staff who are genuinely knowledgeable about fit — a proper in-store try-on is always the best option if it is available to you.

Getting the Alaïa Aesthetic at More Accessible Price Points

If you are drawn to the Alaïa silhouette — that sculpted, body-celebrating, quietly fierce energy — but the investment is not right for you at this moment, there are genuinely brilliant alternatives working with similar shapes and construction principles:

• Reiss — Their bodycon and tailored evening pieces have a sophisticated precision that references the Alaïa approach without the designer price. Sizing runs fairly true to UK standard, making them an easy starting point.

• COS — For the more architectural, minimal pieces from Alaïa’s range, COS produces remarkably clean silhouettes in quality fabrications. They size consistently in European sizing and are easy to navigate.

• Me&Em — Brilliant for structured knits and polished midi dresses. Their sizing is reliable across categories and their quality has improved enormously in recent seasons.

• Massimo Dutti — Particularly strong for tailoring and leather-look pieces that speak to a similar aesthetic. Sizing runs slightly small in trousers, so go up if you are on the border.

• Whistles — For elevated jersey and draped pieces, Whistles is consistently underrated. Excellent quality relative to the price point and reliably true-to-size in UK sizing.

• Phase Eight — Their occasion and formal dresses often have that sculpted, fitted quality you associate with Alaïa. Very consistent sizing and particularly good for curvier frames.

• Hobbs — Classic British tailoring done properly, with sizing that is consistent across categories and a strong range of body-flattering silhouettes at the premium high street level.

For something genuinely left-field, I have been recommending Gauge81 to clients for the past year — a Dutch label beloved by fashion editors for their minimalist, body-conscious knitwear that genuinely rivals the Alaïa aesthetic at a fraction of the cost. Their sizing is European-standard and runs true. Also worth knowing about: Aligne, a British sustainable brand producing beautifully tailored pieces in considered fabrics — independent, excellent, and still under the radar.

One Final Thought Before You Shop

Whatever route you take — splashing out on a new season piece, hunting through resale, or finding a brilliant alternative — the single most important thing you can do before buying Alaïa is know your measurements. Not your usual size. Your actual measurements, in centimetres. This one step will save you the frustration of an expensive return, the sting of a poor fit on a high-investment piece, and the particular heartbreak of a dream purchase hanging unworn in your wardrobe. I speak from experience. Learn from my Old Bond Street moment so you do not have to repeat it.

Find Your Alaïa Size Instantly with Tellar

This is exactly why Tellar.co.uk exists. We built the UK’s leading free sizing tool precisely for moments like this — when you are standing at the checkout of a brand you love, unsure which size to trust and too nervous to guess.

Here is how it works:

• Measure once — just your bust, waist, and hips (or enter an existing brand size you trust)

• Use the Store Size Lookup tool to get your precise recommended size across 1,500+ brands — including luxury and designer labels

• No app to download, no account required. Works instantly in your browser. Always completely free.

Tellar matches your body to each brand’s unique sizing rather than relying on generic conversions — so you get a genuinely accurate result, not a guess dressed up as one.

More from the Tellar Fashion Hub — honest, unbiased, always free:

• The Ultimate Clothing Sizing Guide — everything you need to know about how brands size differently and why

• Jean Trends 2026 — the cuts and washes worth investing in this year

• Ultimate Guide to Dresses & Best Buys — styles by body shape, occasion, and budget

• Ultimate Guide to Jackets & Best Buys — find your perfect outerwear fit

The Tellar Fashion Hub is written by real stylists with no brand sponsorship, no paid placements, and no agenda beyond helping you dress brilliantly. Every post is independent, every recommendation is genuine.

👉 Visit Tellar.co.uk — the UK’s leading free sizing tool

This post was written independently by the Tellar editorial team. No brands featured in this article have paid for inclusion or sponsored this content. All views are our own.