What Is Sizing Like at Posse Clothing?

Posse runs largely true to size, but the fit shifts noticeably from one piece to the next — the relaxed linen dresses and longline vests sit generously, the bandeaus and fitted sets hug the body, and a handful of cropped styles come up surprisingly small. The label uses XXS to XL (roughly a UK 4 to a UK 14), and because so much of the range is natural linen, cotton and silk, the way a garment relaxes or shrinks after a wash matters almost as much as the size on the label. So if you've been staring at your basket wondering whether to take your usual size, here's everything I tell my clients before they commit.

So, how does Posse actually fit?

I've styled and worn a fair bit of Posse over the years, and the honest answer is that it's a brand where the style matters more than the size chart. Here's how the main categories behave:

Maxi and midi dresses: Beautifully proportioned and forgiving. They're cut to skim rather than cling, so most people are safe in their standard size. If you're petite, they're one of the rare maxi brands that won't swallow you whole.
Longline vests and tailored pieces: The vests usually have an adjustable belt or tie at the back, so don't be tempted to size up — take your normal size and cinch to fit.
Bandeaus, bralettes and sets: These run closer to the body and often come as a self-tie, so the fit is more adjustable than fixed. The matching tops can be properly cropped, though.
Boxy and cropped tops: This is the one to watch. Several of the cropped styles come up small and short — if you're between sizes or want a little more length, this is where I'd size up.
Shorts (including the cult bloomer shorts): High-waisted and flattering, generally true to size with a little stretch room.

The fabric factor nobody warns you about

Roughly 90% of Posse's range is linen, cotton or silk, and that's the single biggest reason fit feels inconsistent. Linen has almost no give, so a fitted linen top will feel firmer than the same size in a stretch-woven brand. It also softens and relaxes with wear, and can shrink a touch on a hot wash. My rule: wash Posse cool and dry flat, and buy the size that fits now rather than sizing up "to be safe" — linen rarely needs the extra room you think it does.

Caught between two sizes? My stylist rule

For relaxed or stretch-woven styles (most dresses, the bloomer shorts): take your standard size.
For structured or cropped linen (boxy tops, fitted jackets): lean to the larger size, especially if you want length or are wary of post-wash shrinkage.
For anything with a tie or adjustable belt: size down rather than up — you can always cinch, but you can't shrink a gape.

A little Posse confession

My biggest Posse win was an embroidered cotton-sheeting set I wore to a friend's wedding in Puglia — it photographed like a dream and three people asked where it was from before the starters arrived. My biggest fail? I once ordered a cropped boxy top in my "usual" size for a holiday, ignored every warning that it ran short, and ended up with something that fit beautifully across the shoulders and finished a good two inches higher than I'd hoped. It now lives as a beach cover-up. Lesson learned, and one I now pass straight to you: with Posse, the cropped pieces are the ones to give a second thought.

Where to shop if you love the Posse look

Posse sits in that lovely contemporary-resort space — elevated linen, prints, relaxed tailoring, holiday dressing. If you adore the aesthetic but want options at different price points, these are the brands I'd send you to.

High street

Hush — the best of the high street for easy linen dresses and relaxed holiday separates with that same lived-in feel.
Seasalt Cornwall — coastal, natural-fabric pieces and prints that channel the Posse "by the sea" mood beautifully.
Whistles — for the more tailored, grown-up Posse silhouettes; their linen and broderie pieces are spot on.
Mint Velvet — relaxed-luxe linen and prints with a slightly softer, draped feel.
Monsoon — your go-to for the embroidered, broderie-anglaise occasion dresses Posse does so well.
Boden — bold prints and forgiving summer cuts, brilliant for the playful end of the Posse wardrobe.
Massimo Dutti — the most elevated of the bunch, with crisp linen and resort tailoring that punches above its price.

Premium

Sézane — the French label that nails feminine prints and beautifully cut cotton and linen; the closest in spirit to Posse on quality and charm.
Ganni — Scandinavian, print-led and playful, for those who want the bolder, more directional Posse pieces.

Luxury / designer

Zimmermann — Posse's fellow Australian, and the obvious step up: the same sun-soaked, romantic resort dressing at a designer level.
Max Mara — for investment linen and impeccable summer tailoring that lasts decades.
By Malene Birger — Scandinavian resort-luxe with the prints and easy elegance Posse fans gravitate towards.

Two left-field independents worth knowing

Faithfull the Brand — the Bali-based label is arguably Posse's spiritual sister: hand-prints, linen, and proper holiday dresses you'll wear for years.
DÔEN — the LA romantic label for soft, vintage-inspired florals and dreamy summer pieces with serious staying power.

How Tellar takes the guesswork out

Here's the thing about a brand like Posse, where a Medium dress and a Medium top can fit completely differently — a generic size chart only gets you so far. That's exactly why I built Tellar, the UK's leading sizing tool. You measure once (bust, waist, hip, or just tell us a brand size you already own), and we match your body to over 1,500 brands instantly. No more squinting at size guides, no more guessing.

Measure once, using your bust, waist, hip — or an existing brand size you already trust.
Use the Store Size Lookup to get your precise size in any brand — COS, Reiss, Everlane, Arket and more.
Always free, no downloads needed — it works straight in your browser.

There's also the Tellar Fashion Hub: a library stacked with free posts from our top stylists. Honest, unbiased, independent and always free — style advice, top picks and the best brands, with no sponsored fluff.

A few more guides I'd point you to next:

The bottom line

Posse is a true-to-size brand with a personality — trust your usual size in the dresses and shorts, size up in the cropped linen tops, and respect the fabric. Get those three things right and it's one of the most rewarding wardrobes you can build. And if you'd rather not gamble at the checkout, let Tellar tell you your exact Posse size before you click buy.

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Written by Ella Blake, Senior Fashion Stylist & Founder of Tellar.co.uk