St Agni Sizing: Does It Run Small, True to Size or Large?

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

St Agni sizing runs true to size for most people, but with a deliberately relaxed, minimal silhouette — so if you prefer a more fitted look, sizing down is worth considering, particularly in their clothing. Their shoes, however, tend to come up small and many customers consistently recommend going half a size up.

I'll be honest — the first time I ordered from St Agni I made the classic mistake of assuming Australian sizing would just map directly onto my usual UK size. I ordered my standard size in their wide-leg trousers, and while the waist was spot on, the leg opening was vast. Not in a bad way — that's the point — but I hadn't quite prepared myself for how intentional the oversized proportions are. Once I understood the brand's aesthetic language, it all clicked.

Who Is St Agni?

St Agni is a Byron Bay-born luxury label that's built a fiercely loyal following for its commitment to considered minimalism and sustainable craftsmanship. Founded in 2014, it's the kind of brand that sits confidently in that elevated space between quiet luxury and artisan-made fashion. Think fluid linen trousers, butter-soft leather mules, woven totes and easy separates in a palette of naturals, creams and earthy tones. It's not a brand for maximalists — but if you love clean lines and beautiful fabrics, it's absolutely worth the investment.

St Agni Size Guide: How Does It Translate to UK Sizes?

St Agni uses Australian sizing, which aligns closely with UK sizing. The table below gives you a straightforward conversion:

St Agni clothing ranges from AU 6–16 across most categories, with some accessories and shoes sold in standard small/medium/large or EU shoe sizing.

Clothing: True to Size, But Cut for a Relaxed Fit

The key thing to understand about St Agni's clothing is that the brand designs for movement and ease — not structure. Their trousers, dresses and tops are cut with a lot of intentional room. So while the sizing itself is accurate, the fit is quite loose and flowy by design.

Trousers & wide-leg styles: True to size. Don't be alarmed by the generous leg opening — it's the silhouette.
Dresses & smocks: True to size, though petite frames may find the length long.
Knitwear: Also true to size, but if you like a snugger fit, size down.
Blazers & outerwear: These run with an oversized fit intentionally — size down if you want something more structured.
Tops & shirts: True to size, with a boxy silhouette across most styles.

Shoes: Go Half a Size Up

This is the most important sizing note on the entire page, so I'm saying it plainly: St Agni shoes run small. Nearly every review, every stylist recommendation, and my own personal experience all point to the same conclusion — go half a size up, especially in their mules and loafers. The leather does soften with wear, but starting in too-small a pair is just pain you don't need.

Mules & slides: Size up half a size
Loafers: Size up half a size
Sandals: Generally true to size, but if you're between sizes, go up
Boots: True to size with a standard width fitting

Where to Find Similar Minimalist Brands on the High Street

St Agni pieces come with a luxury price tag — beautiful, yes, but not always an everyday spend. If you love the aesthetic but want more accessible alternatives, these brands are doing the minimalist-luxe thing really well right now:

COS — The closest high street match to St Agni's clean, architectural sensibility. Brilliant for fluid trousers and minimal dresses.
Arket — Considered, well-made pieces with a muted palette. Their linen and cotton separates are genuinely good.
Massimo Dutti — Spanish brand with a grown-up approach to minimalism. The leather goods are particularly worth looking at.
Reiss — For elevated suiting and tailored pieces with a similar quiet confidence.
Whistles — A reliably solid choice for wearable minimalism. Their wide-leg trousers rival the St Agni look at a fraction of the price.
Jigsaw — One of the most underrated British high street brands for understated, quality dressing.
Me&Em — British brand that consistently nails the relaxed-luxe look with excellent sizing and fabric quality.
The White Company — If you love St Agni's neutral palette and linen pieces, The White Company scratches that itch beautifully.

Two Independent Brands Worth Knowing

Nackiyé — A French-Danish label producing beautifully constructed minimal separates in natural fibres. A genuine discovery for lovers of considered, slow fashion.
Nanushka — Budapest-based, globally recognised for their vegan leather pieces and fluid silhouettes. If St Agni is your aesthetic, Nanushka belongs in your wardrobe too.

Premium & Luxury Alternatives

If budget isn't the issue and you just want more options in that considered-luxury space:

Totême — Swedish label, nearly identical in ethos to St Agni. Sculptural, restrained, impeccably made.
The Row — If you want the absolute pinnacle of quiet luxury, The Row is it.
Lemaire — French brand beloved for its deconstructed, artisan approach to everyday dressing.

Find Your Exact St Agni Size in Seconds — Free, No Downloads

Tellar is the UK's leading free sizing tool, matching your measurements to over 1,500 brands including St Agni, COS, Reiss, Arket and more. No guessing. No returns. Just your size, instantly.

Measure once (bust, waist, hips — or use an existing brand size)
Use the Store Size Lookup tool for your precise size in any brand
Always free, works in-browser, no app needed

→ Visit Tellar.co.uk | → Try the Store Size Lookup Tool

Plus, explore the Tellar Fashion Hub — a library of honest, unbiased, unsponsored style posts from our team of stylists. No ads. No sponsored content. Just real advice.