What Is Sizing Like at PrettyLittleThing (PLT)?

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

PrettyLittleThing runs small — often a full size smaller than you'd expect, and if you're shopping their more fitted, bodycon or going-out styles, sizing up by one (sometimes two) is genuinely sound advice rather than just a precaution. It's one of those brands where your usual high street number can feel surprisingly optimistic when the parcel arrives.

I'll be straight with you: PLT is not a brand I'd typically steer my clients towards if fit consistency is a priority. But I understand completely why people shop there — the trend turnover is extraordinary, the prices are some of the lowest on the market, and for a one-wear occasion outfit or a holiday wardrobe refresh, it absolutely does the job. The key is just knowing how to navigate the sizing before you buy, so you're not spending your Friday evening in a returns queue.

I once ordered a satin slip dress from PLT in my usual size for a last-minute birthday dinner. It arrived looking more like a tube top. I'm not particularly tall or broad — it was just genuinely, noticeably small. I've heard this story from so many women since. Size up. Always.

About PrettyLittleThing

PrettyLittleThing — universally known as PLT — launched in 2012 as part of the Boohoo Group and has grown into one of the UK's biggest fast fashion destinations, particularly popular with women in their late teens and twenties. The brand is built around speed: trend pieces that move from catwalk concept to website listing at an almost alarming pace, with price points that make it easy to buy multiple pieces in one go.

The range is vast — dresses, co-ords, going-out tops, loungewear, occasionwear, denim, and seasonal trend edits that track Instagram and TikTok closely. PLT also offers dedicated Petite, Tall, Plus and Maternity ranges, which is genuinely useful and something worth knowing about — more on that below. They stock UK sizes 4 through to 26 in most categories.

PLT Size Guide — Standard Range

PLT uses UK sizing but runs consistently smaller than most UK high street brands. Use this as a guide, and always cross-reference with the specific product measurements where available on their site:

PLT Label / UKEUUSApprox. Bust (cm)Approx. Waist (cm)Approx. Hip (cm)UK 4 / XXS32076–7958–6184–87UK 6 / XS34280–8362–6588–91UK 8 / S36484–8766–6992–95UK 10 / S-M38688–9170–7396–99UK 12 / M40892–9574–77100–103UK 14 / L421096–10078–82104–108UK 16 / XL4412101–10583–87109–113UK 18 / XXL4614106–11088–92114–118UK 204816111–11593–97119–123

Stylist tip: PLT's on-site measurements are often more reliable than the size label. If in doubt between two sizes, check the specific product's measurement guide — they list bust, waist and hip measurements per size on most items — and go by that rather than your usual label size.

The Petite, Tall, Plus & Curve Ranges — Do They Fit Differently?

This is genuinely one of PLT's strengths, and it's worth knowing about properly:

Petite range (5'3" and under): Proportionally adjusted — shorter torso, shorter hems, narrower shoulders. If you're petite and have been buying the standard range and hemming, switch to Petite immediately. The difference is significant and the sizing within the Petite range still runs slightly small, so apply the same "size up" logic.
Tall range (5'8" and above): Longer body lengths, longer sleeves, and hems that actually hit where they're supposed to. Very worthwhile if you're tall and tired of crop tops that weren't supposed to be crop tops.
Plus & Curve range (UK 16–28): PLT's Plus range is extensive and generally praised for being genuinely fashionable rather than an afterthought. The sizing within Plus can still run small, particularly in more structured styles — the same rule applies: go up if you're between sizes.
Maternity range: Good value and well-designed for the price point. The bump allowance is generous and the styles are actually wearable beyond maternity with some clever layering.

Fit by Garment Type — What to Expect

Going-out tops & bodysuits: These run the smallest across the PLT range. Bodysuits in particular are cut very close to the body — if you have a larger bust or broader shoulders, size up by one or even two. The stretch content helps, but there's a limit.
Dresses (bodycon & midi): Consistently small, especially around the hip. Bodycon styles are designed to be tight, but PLT's interpretation of "fitted" can stray into uncomfortably restrictive territory. Go up one size as a starting point. Their midi dresses in floatier fabrics are more forgiving.
Co-ord sets: A PLT signature and often great value. Buy them as a set in the size that fits your largest measurement — usually the hip. The top will have more room but that's easier to work with than a skirt or trouser that won't do up.
Denim: Variable. Their jeans tend to run small and the stretch can be inconsistent — some pairs have great give, others feel more rigid. Size up one to be safe, especially if you're fuller in the thigh or hip. Check the cotton-to-elastane ratio before buying.
Loungewear & oversized styles: This is where PLT is actually most reliable for fit. Oversized hoodies, joggers and co-ords tend to be genuinely relaxed in cut. Your usual size or even a size down works well here.
Occasionwear & satin dresses: The satin and sequin styles look stunning in the photos and can genuinely deliver — but the fit is unforgiving. Always size up here, and check the length if you're above 5'6", as what reads as a midi can sit above the knee in real life.
Knitwear: More forgiving than most PLT categories. True to size or size up if you want a relaxed, oversized look. Quality varies considerably here though — check fabric content carefully before buying.

My Honest PLT Sizing Advice

Default to sizing up by one. Across fitted styles especially, this is the safest starting point. You can always belt a slightly looser dress; you cannot comfortably breathe in one that's too small.
Check the product measurements, not just the size chart. PLT lists actual measurements on most product pages — use them. A UK 12 in one dress style can have very different dimensions to a UK 12 in another.
Use the right sub-range. If you're petite or tall, the dedicated ranges genuinely make a difference. Don't just buy the standard range and hope for the best.
Read the reviews — specifically the "fit" comments. PLT's review section is actually useful and very active. Other shoppers will tell you directly if a particular style runs particularly small or large.
Be realistic about fabric quality. PLT pieces can look brilliant and photograph beautifully, but at these price points, the longevity isn't always there. They're often best for trend pieces you'll wear for a season, not investment buys.

Looking for a Similar Vibe With Better Fit Consistency? Try These

If you love PLT's trend-led energy but want fewer sizing surprises, here's where I'd look across different budgets:

High Street & Accessible:

ASOS — The most direct like-for-like alternative. Vast range, similar trend speed, but with better sizing consistency and more reliable product measurements. Their own-brand pieces are worth exploring for party and occasion dressing.
Zara — The gold standard for trend-driven high street dressing. Better construction and fabric than PLT at a slightly higher price, and their sizing — though it has its own quirks — is more consistent within ranges.
Urban Outfitters — Great for the going-out and festival edit. Similar youthful energy to PLT but with a slightly more considered aesthetic and better quality basics.
Topshop — Now primarily on ASOS. Still brilliant for trend pieces, partywear and denim, with a strong heritage in exactly the market PLT competes in.
River Island — Consistently well-reviewed for going-out dresses, co-ords and party pieces. More reliable sizing than PLT and the quality is a step up for comparable prices.
Abercrombie & Fitch — A genuine glow-up story. Their denim and going-out pieces are now very well-regarded, and their sizing is notably more accurate and consistent than PLT's.
French Connection — If you want PLT's going-out dress energy but with actual construction. Their going-out and occasionwear pieces are polished, well-fitted and genuinely wearable beyond a single event.
Hollister — Great for the casual, beach-inspired pieces that PLT does. More consistent in fit and a solid choice for denim, tops and summer dressing.

Premium Step-Up:

All Saints — The brand to graduate to when you want PLT's edgier aesthetic but in genuinely quality fabrics and construction. Their slip dresses, leather pieces and tailoring are exceptional.
Anthropologie — For when you want print, colour and femininity with a more artisan, considered feel. Sizing is consistent and the quality is a significant step up from fast fashion.
Reiss — The investment version of PLT's occasionwear. Beautifully cut going-out and work-to-event pieces that will last seasons rather than a single night out.

Two Independent Labels Worth Discovering:

Oh Polly — A Manchester-born independent brand that occupies exactly the same going-out space as PLT but with noticeably better quality and more reliable sizing. Their bandeau and bodycon dresses are particularly well made for the price, and the brand has built a genuinely loyal following. If you love PLT occasionwear and want a step up in quality without a huge price jump, Oh Polly is your first stop.
Club L London — Another independent UK label that punches above its weight for going-out and event dressing. Their satin, sequin and cut-out styles are well constructed, surprisingly well-fitting, and frequently end up on red carpet round-ups in Grazia and Heat. A genuinely brilliant alternative to PLT's occasion range and one that more people should know about.

Stop Guessing Your PLT Size — Use Tellar

PLT's inconsistent sizing is exactly the kind of problem Tellar.co.uk was built for. When a brand runs small, varies by garment type, and has different sub-ranges for Petite, Tall and Plus — knowing your measurements and how they map to each product makes all the difference between a great buy and an annoying return.

Tellar is the UK's leading clothing sizing tool — completely free, no downloads, no subscriptions. You measure once (bust, waist, hips — or just enter a brand size you know fits you), and Tellar instantly matches you to your correct size across 1,500+ brands. No more guessing, no more two-size orders, no more sizing drama.

✔ Free — always, works entirely in your browser
✔ Covers 1,500+ brands from fast fashion to luxury
✔ Honest & editorially independent — no brand sponsorship, ever
✔ Use the Store Size Lookup tool to find your size at any brand instantly

And once you've sorted your sizing, explore the Tellar Fashion Hub — a growing library of free, unsponsored posts on sizing, brand guides, trend edits and honest style advice. Written by real stylists. Never paid for by brands.

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