What Is Sizing Like at JD Williams? An Honest Stylist’s Guide

By Ella Blake – Senior Fashion Stylist & Founder | Tellar – Always honest, unbiased & unsponsored post

JD Williams generally runs true to size, with a gentle leaning towards generous – particularly across its casual, jersey and everyday ranges, where I’d often suggest sizing down if you’re between two sizes. It’s one of the most genuinely size-inclusive retailers in the UK, spanning roughly UK 8 to UK 32 with dedicated petite, regular and tall fits, so the brand has clearly put real thought into how clothes sit on a wide variety of bodies. That said, “true to size” is never the whole story with any retailer, so let me talk you through what I’ve actually seen on real people in the fitting room.

So, does JD Williams come up big or small?

In my experience styling clients of every shape, JD Williams is one of the more forgiving fits on the high street. A few patterns worth knowing:

Casual and jersey pieces – tunics, loungewear, stretchy dresses and t-shirts tend to run slightly roomy. If you like a closer fit, take your usual size; if you want a relaxed drape, you’re already covered.
Structured and tailored items – blazers, shirt dresses and anything with a defined waist sit closer to true measurement, so I’d trust your standard size here.
Denim – this is where JD Williams quietly shines. Jeans come in slim, straight, bootcut and jegging shapes across multiple leg lengths, which is a rare luxury. Waistbands can be a touch generous, so a size down is often the sweet spot.
Footwear – they offer wider fittings as standard, which I love, but it does mean standard widths can feel a little roomy. Half a size down works for many.

A quick confession: early in my styling career I ordered a JD Williams wrap dress in my “safe” size for a client, assumed it would be snug, and it arrived swimming on her. Lesson learned – with this brand, I now always check the actual measurements rather than the size label, and nine times out of ten that’s the difference between a return and a keeper.

How to nail the fit first time

The single biggest mistake I see is shopping by dress size alone. Sizes drift wildly between retailers – a 14 at one shop is a 16 at another – so the label tells you very little. My fitting-room routine is simple:

Measure your bust, waist and hips with a soft tape, snug but not tight.
Compare those numbers to the garment’s flat measurements, not the size name.
For dresses and waisted pieces, size to your largest measurement and tailor the rest.
If you’re petite or tall, use JD Williams’ length-specific ranges rather than turning up hems – the proportions are designed to sit correctly.

Where else to shop for the same vibe

JD Williams sits in that brilliant space of accessible, comfortable, genuinely wearable fashion with real size range behind it. If you love that, here’s where else I’d send you, tiered by budget.

High street favourites

M&S – the gold standard for everyday classics with reliable fit, plus petite and tall lines that rival JD Williams for choice.
Next – superb for broad size ranges and consistent sizing across petite, regular and tall, with strong workwear and denim.
Seasalt Cornwall – relaxed, beautifully printed pieces in soft natural fabrics; runs comfortable and is a joy for an easygoing wardrobe.
Fat Face – casual, cosy and forgiving in fit, brilliant for laid-back weekend dressing.
White Stuff – quirky prints and relaxed shapes with a loyal following; sizing is generous and gentle.
Joules – cheerful British style, prints and knitwear, with a relaxed everyday fit.
Phase Eight – my pick for occasionwear; flattering cuts that go up to a good size range and run true to size.
New Look – trend-led and budget-friendly, with a dedicated Curves range if you want something more fashion-forward.

Premium picks

Boden – joyful colour and print, excellent quality, with a wide and well-thought-through size range.
Mint Velvet – elevated, relaxed-luxe separates that feel special but wear easily.

Luxury & designer

Marina Rinaldi – Max Mara’s exquisitely tailored size-inclusive line; investment pieces with impeccable fit if you want to spoil yourself.
Me&Em – clever, considered British design with cuts engineered to flatter across a generous size span.

Two independents worth discovering

Lucy & Yak – the Brighton-born ethical independent famous for dungarees and bold prints, with one of the most inclusive size ranges around and a real personality to its pieces.
Snag – a brilliantly body-positive independent that built its name on tights that actually fit every shape and has grown into joyful, genuinely inclusive clothing.

Stop guessing your size for good

Here’s the honest truth after years of styling: no size chart can keep up with how differently every brand cuts its clothes. That’s exactly why I built Tellar.

Find your exact JD Williams size in seconds

Tellar is the UK’s leading free sizing tool – your body matched precisely to 1,500+ brands instantly, so you never have to squint at a size guide again.

Measure once – using your bust, waist, hip, or an existing brand size you already own.
Use the Store Size Lookup tool to get your precise size in any brand – COS, Reiss, Everlane, Arket and more.
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➤ Visit Tellar.co.uk➤ Try the Store Size Lookup tool

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The Tellar Fashion Hub is a library stacked with free posts from our top stylists. Honest. Unbiased. Independent. And always free – style advice, top picks and the best brands for every body. A few to read next:

Whether you’re petite, tall, curvy or somewhere in between, the right fit is out there – and with the measurements in your pocket, JD Williams is a lovely, forgiving place to start. Happy shopping. – Ella x