What Is Sizing Like at Pretty Little Thing?

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

Pretty Little Thing (PLT) runs small — particularly on tops, dresses, and bodysuits, where sizing up at least one is the near-universal advice from customers. Bottoms are more reliable and generally true to UK size, but the inconsistency across the brand's vast range means you genuinely cannot assume one size fits all. With PLT, you have to check each item individually.

I'll be honest with you — Pretty Little Thing is not a brand I'd typically reach for as a stylist in terms of long-term wardrobe investment. The quality is fast fashion through and through, and I've had clients return frustrated hauls more times than I can count. But here's the thing: PLT absolutely has its place. For a one-off night out, a festival outfit, a holiday cover-up, or a trend you want to try before committing — it delivers at a price point that's genuinely hard to argue with. The trick is knowing exactly how to navigate the sizing, because it will catch you out if you're not paying attention.

PLT was founded in Manchester in 2012 as part of the Boohoo Group and has grown into one of the UK's biggest fast fashion names, serving a very young, trend-hungry demographic with bodycon dresses, co-ords, going-out pieces, and influencer-approved looks at very low prices. They release new styles constantly — literally daily — which is also part of why sizing can be so erratic. Different factories, different fabric compositions, different cuts arriving week after week. So let's break down what actually matters.

Pretty Little Thing Size Conversion Table

PLT uses standard UK sizing labels. Here's how that converts across regions — and crucially, the actual body measurements PLT's own size guide maps to each size:

PLT SizeUK SizeEU SizeUS SizeBust (inches)Waist (inches)Hips (inches)4UK 432030.5"23.5"33.5"6UK 634231.5"24.5"34.5"8UK 836432.5"25.5"35.5"10UK 1038634"27"37"12UK 1240835.5"28.5"38.5"14UK 14421037.5"30.5"40.5"16UK 16441239.5"32.5"42.5"18UK 18461441.5"34.5"44.5"

The golden rule with PLT: Always size up one on tops, dresses, and bodysuits. The label says one thing, the garment delivers another — particularly in non-stretch fabrics where there is zero give. Bottoms are more trustworthy; stick to your usual UK size for jeans, trousers, and shorts. And always — always — read the individual item reviews before you buy.

PLT's Specialist Ranges — What You Need to Know

One thing PLT genuinely does well is offering specialist fits beyond standard sizing. If you fall outside the mainstream, there's actually a decent range built for you:

PLT Petite — For women 5'4" and under. Shorter hems, sleeves that don't swamp you, proportions that actually make sense. This is genuinely useful and often overlooked. Sizes run UK 4–18.
PLT Tall — For women 5'9" and over. Longer inseams, longer bodices, sleeves that reach your wrists. Again, a real improvement on ordering standard and hoping for the best. Sizes run UK 6–18.
PLT Plus — Sizes UK 16–30, with a dedicated range that has grown considerably in recent years. The same sizing-up advice still applies within this range.
PLT Shape — Designed specifically for hourglass figures (sizes UK 6–18), with more generous hip and bust allowance built in relative to the waist. If you're curvy and have previously found PLT's standard sizing cuts too straight through the body, this range is worth trying first.
PLT Maternity — A full maternity collection that adjusts proportions for bump sizing at each size. Their Maternity M is equivalent to UK 10–12 in the body but with expanded bump measurements.

PLT Sizing by Garment Category

Because sizing varies so wildly across the range, here's a practical category-by-category breakdown:

Bodycon dresses: PLT's bread and butter — tight, short, and designed to fit slim. These run small consistently. Size up one as standard, sometimes two if you have a fuller bust or hips. Check that the fabric has stretch; non-stretch bodycon is absolutely unforgiving.
Midi and maxi dresses: Generally more relaxed in cut, and slightly more forgiving. Still worth sizing up one, but the fit is less critical here than in bodycon styles.
Tops and bodysuits: Runs small. Size up one across the board. Bodysuits in particular have almost no give at the bust and can feel restrictive even a size up. If you're larger than a D cup, go up two sizes.
Co-ords and sets: Where the inconsistency really bites — the top and the bottom of a co-ord may be cut by different factories with different sizing logic. If you can, buy separately so you can size up the top independently of the bottom.
Jeans and trousers: More reliable. Stick to your usual UK size as a starting point, though the waistband can still run a touch tight if you're between sizes.
Knitwear and oversized pieces: These are by design loose — going true to size or even sizing down will still give you the intended slouchy look.
Occasion and going-out blazers: True to size on the body but shoulder seams tend to sit wide, so petite women may find the shoulder drops too low. PLT Petite range is a better bet for structured pieces.

Getting the Most Out of PLT — Stylist Tips

Look — I won't pretend PLT is going to replace a well-considered wardrobe of quality pieces. But if you're shopping here, you're probably looking for impact at low cost, and that's a perfectly legitimate goal. Here's how to do it well:

Lean into the going-out category. This is where PLT genuinely excels — party dresses, sparkly co-ords, barely-there going-out tops. Buy it, wear it to the wedding/hen do/birthday, and feel great. Don't expect it to last five years.
Avoid structured pieces. Anything with tailoring or structure is where cheap construction shows most painfully. The blazers, structured trousers, and occasion coats look good in photos and fall apart in real life. For those pieces, invest elsewhere.
Read every single item review. This is non-negotiable with PLT. Unlike brands with consistent sizing, a PLT size 10 in one dress is not the same as a PLT size 10 in the next. Reviews from customers with similar measurements to yours are the most valuable tool you have.
Check the fabric content. Stretch fabrics (jersey, elastane blends) are far more forgiving of the sizing inconsistency. Non-stretch wovens are a lottery. When in doubt, favour stretch.
Use the PLT Shape or specialist ranges first. If you're petite, tall, or curvy, going straight to the specialist range will save you significant returns headaches.

Better Alternatives at Every Budget

Whether the quality isn't meeting your expectations or you simply want more sizing reliability, here are my honest picks:

High Street — More Reliable Sizing, Similar Price Points

ASOS — The closest direct comparison to PLT in terms of breadth and price, but with more consistent sizing, better quality control across their own-brand lines, and an exceptional returns policy. Their own-brand party pieces rival PLT's going-out range easily.
River Island — Brilliant for going-out dresses, occasion pieces, and trend-led separates with noticeably better construction than PLT. Sizing is far more consistent and their denim is genuinely excellent.
New Look — Similarly affordable to PLT but with more reliable UK high street sizing. Their petite and tall ranges are well-developed, and the denim is a consistent strong suit.
Zara — If you're willing to spend slightly more for a massive step up in quality and longevity, Zara delivers trend-led pieces that actually hold their shape. Sizing runs slightly small on occasion, but is far more consistent than PLT.
Topshop — Now online-only via ASOS, but Topshop's own-brand pieces remain popular for party dresses and going-out looks with better quality fabrication than PLT at broadly similar prices.
H&M — Reliable sizing, accessible prices, and their & Other Stories sister brand offers a serious step up in quality if you find yourself wanting more. H&M's occasionwear range has improved considerably in recent seasons.
Mango — The natural step up from PLT if you want the same trend energy but clothes that actually fit properly and last. Mango's party and going-out pieces are genuinely stylish, far better constructed, and only marginally more expensive.

Independent & Niche Picks

Nobody's Child — A brilliant independent UK brand offering PLT-adjacent styles — midi dresses, print-led pieces, going-out options — but made from sustainable fabrics, with consistent sizing and far better construction. Prices are only a little higher than PLT and the quality difference is enormous. If you're starting to outgrow fast fashion but still want fun, affordable dressing, this is your next step.
Lavish Alice — A UK independent brand that occupies the same going-out and occasion space as PLT but pitches considerably higher on quality. Their structured satin co-ords and occasion dresses are genuinely beautiful and sized accurately. Still affordable compared to premium brands, and the kind of thing you'll actually want to wear again.

Premium

French Connection — For going-out and occasion pieces that will outlast a PLT order by years. Their party dresses and going-out blazers are stylishly cut with proper fabric weight, and they size consistently to UK standard.
Ted Baker — A step up in occasion dressing with beautiful fabrication and reliable sizing. If you're buying for a specific event and don't want to risk a PLT gamble, Ted Baker's occasion range is consistently excellent.

Luxury / Designer

Self-Portrait — The designer destination for elevated going-out dressing. If the PLT aesthetic is your starting point — fitted, feminine, occasion-ready — Self-Portrait is where that instinct ends up when quality matters. Their lace and mesh pieces are the blueprint that PLT has always been trying to copy.

The PLT Sizing Problem — Solved

Pretty Little Thing's inconsistency is honestly one of the most common sizing frustrations I hear about — and it's completely avoidable. The issue is never really the brand; it's not knowing your actual measurements and how they map to each specific garment. That's exactly what Tellar.co.uk is built for.

Tellar is the UK's leading free sizing tool — measure your bust, waist, and hips once, and it instantly matches your body to the correct size across 1,500+ brands. No more guessing, no more returns you have to pay for, no more ordering three sizes to find the one that fits. Two minutes to set up, completely free, works straight in your browser.

✔ Measure once — bust, waist, hips — and never check a size chart again
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