What Is Sizing Like at Faithfull the Brand?

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

Faithfull the Brand runs small — often significantly so — and if you're shopping from the UK without knowing this going in, you're very likely to order the wrong size. I've seen it happen to clients more than once: a dreamy floral midi arrives, looks absolutely perfect on the hanger, and then refuses to do up at the waist. The brand uses Australian sizing, the fabrics have almost no stretch, and the cuts are close to the body in all the areas where it matters most — bust, waist and hips. Size up. Often by one, sometimes by two if you're curvy or full-busted. That's the short answer. Keep reading and I'll give you the full picture.

The Brand in Brief — Why Everyone Keeps Talking About It

Faithfull the Brand was founded in Bali by two friends — Australian Sarah-Jane Abrahams and Norwegian Helle Them-Enger — who met while travelling and decided to build something together. The result is a brand with an unmistakeable aesthetic: vintage-inspired florals, artisan-made linen and rayon pieces, breezy midi dresses, wrap silhouettes and a general sense of having just stepped off a yacht somewhere warm. Margot Robbie is a fan. It's all made in Bali with a genuine commitment to ethical production. It's also, frankly, one of the more covetable holiday and occasion brands out there right now — which is exactly why getting the sizing right matters so much.

Australian Sizing: What UK Shoppers Need to Know

The number on the label looks familiar — AU 8, AU 10, AU 12 — but here's the catch: Australian garment measurements tend to run smaller than their UK equivalents in practice, particularly through the bust and hips. And because Faithfull's fabrics are almost entirely non-stretch (linen, rayon, cotton voile), there's zero forgiveness if you land between sizes.

Here's a rough conversion guide:

Faithfull / AU SizeUK Size (approx.)US SizeEU SizeXS / AU 66–8234S / AU 88–10436M / AU 1010–12638L / AU 1212–14840XL / AU 1414–161042XXL / AU 1616–181244

Use this as a starting point only — and factor in the category-specific fit notes below before you decide.

How Faithfull Fits, Garment by Garment

Dresses and jumpsuits: This is the heart of the brand — and where the sizing is most unforgiving. The bodice and waist are cut closely, and if you're full-busted or have a defined waist-to-hip ratio, you'll almost certainly need to go up at least one size. For some of the more structured styles like the Roman Midi, reviewers regularly report sizing up by two. Don't risk it — go up and have a dress taken in if needed. A tailor costs far less than a return.
Tops and blouses: Fitted cami or bardot styles run small through the bust and shoulder — size up. The looser, more relaxed blouses (think oversized linen shirts, wrap blouses) are more forgiving and often true to size or even slightly generous. Read the product description carefully and look at the silhouette — that will tell you everything you need to know.
Skirts and shorts: Generally closer to true to size, but high-rise styles can feel snug at the waist. If you're between sizes here, go up.
Trousers: Slim and straight cuts are Faithfull's default — these suit a more petite or narrow frame well. If you're curvier or have more volume in the hip and thigh, size up without hesitation. Also worth checking the inseam length as the brand tends to cut for a shorter leg.
Swimwear: Size to your bust first. Faithfull's swim separates are gorgeous but can be snug across the chest. Many women with a fuller bust go up a size in the top and stay true in the bottom.

The Fabric Is Everything — Here's Why It Matters

Most Faithfull pieces are made from linen, rayon or cotton — all of which are beautiful, breathable and perfect for the brand's holiday aesthetic. But none of them stretch. At all. This is the key reason why the sizing feels so unforgiving: there's no give in the fabric to accommodate any difference between you and the cut. A dress that sits millimetres too tight at the chest simply won't work — and you can't will it larger. Linen in particular can also shrink slightly with washing, so if anything, I'd err on the side of sizing up even when the current fit feels just right.

My Honest Stylist Take

I have a genuine soft spot for Faithfull. The prints are beautiful, the vintage silhouettes are genuinely flattering when you get the right size, and the ethical production story is one of the better ones out there in this price bracket. But I've also watched too many women order based on their usual size and feel deflated when it doesn't fit. The golden rule: treat your Faithfull order like you would any Italian or Australian label — approach it with healthy scepticism about the label, measure yourself before you buy, and always go up if you're between sizes.

Love the Aesthetic? Here Are My Brand Picks by Budget

If you love Faithfull's world of floral prints, relaxed silhouettes and artisan craftsmanship, here are the brands I'd point you towards at every price point:

HIGH STREET

Anthropologie — The closest high street equivalent to Faithfull's romantic, print-led aesthetic. Floaty midi dresses, vintage-inspired florals and beautifully detailed blouses. Sizing varies slightly by brand carried, so always check individual product reviews. A genuinely brilliant alternative.
Monsoon — An underrated gem for floral and occasion dressing. The print-led midi dresses and linen separates overlap strongly with Faithfull's identity. Sizing is true to UK standard and very consistent — a relief after Australian brands.
Mango — Consistently excellent for summer dressing. Their linen dresses and flowy blouses are well-priced and genuinely stylish. Sizing runs true and the quality has improved significantly over recent seasons.
Urban Outfitters — A surprisingly strong source for bohemian-leaning dresses, printed minis and relaxed summer separates. The price point is accessible and the aesthetic overlaps well with Faithfull's boho energy. Sizing is generally true to UK.
Oliver Bonas — Often overlooked in this conversation, but Oliver Bonas does lovely printed dresses, floral blouses and occasion-ready midi skirts at a very reasonable price. Sizing is reliable and UK-consistent.
White Stuff — Brilliant for the more relaxed, linen-led side of Faithfull's wardrobe. Think easy-wearing printed dresses, lightweight blouses and fluid trousers. Sizing runs true, with a slightly more generous cut than Australian brands — a welcome change.
Phase Eight — For the more structured or occasion-ready Faithfull pieces — think wrap dresses and floral midis — Phase Eight is a strong high street alternative. Beautifully cut and consistently true to UK sizing.

PREMIUM

Réalisation Par — An Australian brand with a nearly identical aesthetic to Faithfull: vintage-inspired silk-feel dresses, romantic prints, relaxed silhouettes. The same sizing caveats apply — runs small — but the quality is excellent and the pieces are stunning. A direct step-up from Faithfull.
Reformation — For the more polished, editorial end of Faithfull's aesthetic. Beautiful fabrics, flattering silhouettes and a strong sustainability story. Sizing uses US numbers and tends to run true, though slim through the hips.
Ulla Johnson — An American designer with a deeply romantic, artisan-made sensibility that mirrors Faithfull's DNA beautifully. The embroidered dresses and printed midi skirts are exceptional. Sizing is true to US standard.

LUXURY / DESIGNER

Zimmermann — The Australian luxury benchmark that Faithfull fans consistently grow into. If you love Faithfull's prints and silhouettes, Zimmermann is where the aesthetic goes at a higher quality and higher price point. Australian sizing — same principles apply, always size up.
Johanna Ortiz — Colombian-born and globally adored, Johanna Ortiz does the most extraordinary printed occasion dresses. Bold, joyful, and exquisitely made. A natural next step for Faithfull devotees with a bigger budget.

TWO INDIE PICKS WORTH DISCOVERING

Every post I try to flag a couple of brilliant smaller labels — the brands you won't see everywhere but absolutely should:

Kivari — An Australian indie brand that's deeply aligned with Faithfull's world: artisan-made linen dresses, earthy florals, ethical production and a beautiful boho-meets-coastal sensibility. Genuinely underrated and worth every penny. Australian sizing — size up as you would with Faithfull.
Agua by Agua Bendita — A Colombian resort brand producing some of the most beautiful printed pieces in the market right now. Handcrafted, bold, and absolutely joyful. Less known in the UK than they deserve to be — but that's changing fast. Sizing is South American, so check the brand's own guide carefully.

Never Get Your Faithfull Size Wrong Again — Use Tellar, It's Free

Australian sizing, non-stretch fabrics and close-cut silhouettes make Faithfull the Brand genuinely tricky to size for from the UK — especially online. That's exactly why Tellar.co.uk exists.

Tellar is the UK's leading free sizing tool. It matches your body measurements — bust, waist and hips — to over 1,500 brands in real time, including Faithfull the Brand, so you always know your exact size before you buy. No guesswork. No expensive returns.

Measure once — just your bust, waist and hips (or use a brand you already know fits you)
Get your precise size instantly across 1,500+ brands using the Store Size Lookup tool
Completely free — no downloads, no subscription, works in-browser on any device

And explore the Tellar Fashion Hub — a library of 5,000+ honest, independent, unsponsored style guides written by in-house stylists. No ads, no sponsored content, no brand influence. Ever.

👉 Visit Tellar.co.uk | Try the Free Store Size Lookup

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