Quick Verdict: Which Brand Suits Which Shopper

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Editorial illustration supporting this section.

Neither brand can honestly be called "truer to size". They simply ask you to choose a size in different ways, so the better starting point depends on how you like to shop.

Choose Next as your starting point if you prefer UK numeric sizes tied to your body. Its women's guide maps each UK size to bust, waist and hip measurements, and it links trouser lengths to height bands.

Choose Uniqlo as your starting point if you are comfortable choosing by fit style and reading garment measurements. Uniqlo says items sharing a label such as XS, S, M, L or XL can fit differently, because each is designed with a specific fit: regular, slim, relaxed or oversized. It points shoppers to product-page measurements, size charts and tools rather than one universal chart.

One caution applies to both. Press coverage of vanity sizing shows that a label alone is an unreliable guide at any high-street brand, so your own measurements should carry more weight than the number or letter on the tag.

This guide is editorial advice built from official size guides and independent editorial sources. We did not try on garments, and nothing here is a hands-on fit test. For measuring technique and for converting between UK, US and EU sizes, see our guides on how to measure yourself and on clothing size conversion.

How Uniqlo and Next Present Sizing

Uniqlo: letter labels, fit categories and a toolkit

Uniqlo's help centre explains that XS, S, M, L and XL labels do not guarantee an identical fit across products. Its answer is a set of tools on each product page:

  • MySize ASSIST
  • measurement explanations
  • product details
  • a size chart
  • a product size comparison
  • a height-based fit guide
  • StyleHint and customer reviews

Think of the letter as a rough starting point, and of the item's fit type and measurements as the real information.

Next: UK numbers and body-measurement tables

Next's women's tops and dresses chart runs from UK 4 to UK 26. It lists bust, waist and hips in both centimetres and inches. Next also keeps separate sizing guides for women, men, homeware, pets and third-party brands. Some footwear, such as slippers, uses S, M, L and XL labels alongside UK, EU, US and AU/NZ sizes.

What this means for you

Letter sizing and numeric sizing give you different starting assumptions. With Next's numeric charts, you begin with your body and look up a size. With Uniqlo's letters, you begin with the style of fit you want and then check the measurements of that particular item. Our guide to UK/US/EU size conversion explains why numeric and letter systems do not translate neatly.

How We Compared the Two Brands

This comparison rests on three kinds of source:

  • official help-centre and size-guide pages from Uniqlo and Next
  • an independent editorial review of one Uniqlo item
  • two independent news reports on vanity sizing

We did not try on any garments, and we make no claim of personal fit testing.

Some limits are worth knowing:

  • Uniqlo's chart values. The Uniqlo UK size-chart page we reviewed gave no readable figures. Our Uniqlo comparisons therefore rely on the help centre's guidance, not on specific chart values.
  • Next's brand guides. Next's Brand Sizing Guides cover other labels, such as Phase Eight and Speedo. They are not Next's own-brand measurements and are used here only to show how labels differ.
  • Age of the vanity-sizing sources. The two reports date from 2010 and 2014. They are context, not current measurements.
  • Live charts. Size charts change. Verify against the live product-page chart before you order.

Body Measurements vs Garment Measurements

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Show how to order from body-measurement charts versus garment-measurement and fit-type information, supporting the side-by-side comparison.

Show how to order from body-measurement charts versus garment-measurement and fit-type information, supporting the side-by-side comparison

The core difference is what each brand asks you to measure against. Body-measurement charts help you choose a size before you think about cut. Garment measurements show how much ease is built into a particular item.

Next's route: measure your bust, waist and hips, find your UK size in the chart, then pick a trouser length by height band.

Uniqlo's route: check the fit type, read the product's garment measurements, then use the size chart or the comparison tool. Uniqlo also recommends the height-based length guide to see where a garment may sit.

A worked example from Next's chart

Next lists UK 10 as bust 86.5 cm, waist 71 cm and hips 95 cm. UK 12 is listed as 90 cm, 74 cm and 99 cm. These are body measurements. We do not translate them into Uniqlo letters, because the evidence reviewed does not give a single UK-numeric equivalent for Uniqlo's letter sizes. Any mapping must be checked on the live chart.

Side-by-side summary

Next Uniqlo
Sizing system UK numeric (4–26 for women's tops and dresses) Letter labels (XS, S, M, L, XL)
Measurement basis Body: bust, waist, hips (cm and inches) Garment measurements and fit type per item
UK numeric equivalents Native Not confirmed in the evidence reviewed
Length options Trouser lengths by height band Height-based length guide
Decision tools Size tables with measuring prompts MySize ASSIST, size chart, product size comparison, StyleHint, reviews

Next's trouser guide ties length figures to height bands: Petite 69 cm, Regular 74 cm, Long 79 cm, Extra Long 84 cm and Tall 89 cm. Our how-to-measure guide covers bust, waist, hips and leg length.

Where Each Brand Helps You Choose Well

These strengths concern the information each brand provides. They are not proof of better real-world fit.

Uniqlo

  • Fit types spelled out. Uniqlo names regular, slim, relaxed and oversized fits, so you can set expectations by style.
  • Several self-serve tools. These include MySize ASSIST and a product size comparison.
  • A broad range on at least one flagship basic. NBC Select's reviewer describes the Uniqlo U Crew Neck T-shirt as boxy and heavyweight, and notes a size range of XXS–3XL. That is one reviewer's opinion on one item, published in April 2025.

Next

  • Clear body-based charts. Next gives centimetre and inch figures for each UK size in tops and dresses, running from UK 4 to UK 26.
  • Length by height. Its trouser options by height band reduce guesswork on leg length.

If you like to start from a table of your own measurements, Next's presentation is the more direct. If you like to compare a garment's dimensions with a favourite item from your wardrobe, Uniqlo's emphasis suits you better.

Where Each Brand Falls Short

Uniqlo

Uniqlo itself states that the same label can fit differently by design. That means you cannot assume one letter size across the range. Choosing by letter alone risks mis-sizing, for example if you move between a slim item and an oversized one. Item-level checking is essential.

Next

Next's body-measurement chart tells you which size matches your body. It does not describe garment ease or cut for a given style, so it cannot tell you how roomy a particular top or pair of jeans will be. Next's brand-guide page also contains at least one visible typo in a kids' size range, so double-check figures against the live page.

Gaps in the evidence

  • The reviewed evidence does not include Next's men's chart or Uniqlo's full numeric tables, so we make no comparison on those.
  • The NBC review covers a single Uniqlo item, is US-oriented and is an opinion, not a measurement study.

What Vanity Sizing Means for UK Shoppers

Vanity sizing is when brands make garments larger without changing the label, so a shopper feels they are buying a smaller size. Two independent reports give useful context, though both are dated.

Racked, 2014 (reported by Refinery29). Racked compared jeans from 25 stores and found that an average size 8 measured 28.9 inches at the waist and 38.7 inches at the hips. The report said Uniqlo and Zara ran large, with about four inches added to Uniqlo waists and two inches to Zara hips. This concerns size-8 jeans in 2014 and may not reflect current ranges.

Marie Claire, 2010. Marie Claire reported that sizes varied between UK stores. It said M&S had increased its website measurements by up to two inches while stating that its block sizes had not changed since 2003.

Neither source measured Next, so we draw no vanity-sizing verdict on Next. We also do not infer that either brand is currently better or worse.

The takeaway is practical. A size label is a brand-specific code. Compare measurements, not numbers, and see our size conversion guide for why conversions are only approximate.

Petite, Tall and Plus: Which Brand Gives More Options

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Help petite, tall and plus-size shoppers see which length and size-range tools each brand's sources document, and where the evidence stops.

Help petite, tall and plus-size shoppers see which length and size-range tools each brand's sources document, and where the evidence stops

Length

Next lists four trouser height options:

Option Height
Petite 4'11"–5'3" (150–160 cm)
Regular 5'3"–5'6" (160–167.5 cm)
Long 5'6"–5'10" (167.5–177.5 cm)
Extra Long and Tall 5'10"+ (177.5 cm+)

Uniqlo's guide includes a height-based length guide to show where garments sit. It is a fit aid and is not described as a separate petite or tall range.

Size range

Next's women's tops and dresses chart reaches UK 26, which lists a 128 cm bust. NBC Select notes that the Uniqlo U Crew Neck T-shirt is available in XXS–3XL. That applies to that one item only.

Where the evidence stops

The evidence reviewed does not confirm dedicated petite, tall or plus lines at Uniqlo, so we make no claim either way. It also contains no Next men's data. On this evidence, Next documents more explicit length bands and a stated size run. That does not make it better for plus sizes. Check the live product page for each item if you are outside the standard range. Our petite, tall and plus fit guides go further.

Alternatives When Neither Fits

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Give readers a practical path when neither brand's sizing works: use brand-specific charts, measure first and plan for returns.

Give readers a practical path when neither brand's sizing works: use brand-specific charts, measure first and plan for returns

If neither brand works for you, use a measure-first routine:

  1. Measure yourself. Use our how-to-measure guide.
  2. Use that brand's own chart. Never assume your usual size transfers. Next's brand-guide page shows how much labels differ. Phase Eight's UK 10 lists a bust of 88 cm, whereas Next's own UK 10 lists 86.5 cm. Phase Eight also publishes S/M and M/L bands covering ranges of bust, waist and hips. The page keeps separate charts for Phase Eight, Ugg, Clarks and Speedo.
  3. Check the returns policy before buying. Returns are your fallback when letter and numeric labels disagree.
  4. Use category-specific charts. Footwear and activewear should follow their own tables, such as Next's foot-length tables.

For other UK high-street options, see our White Stuff sizing guide and Sweaty Betty sizing guide. This evidence set does not assess those brands, so we make no fit claims about them.

Frequently Asked Questions

Is a UK size 12 at Next the same as a medium at Uniqlo?

Don't assume so. Next lists UK 12 as bust 90 cm, waist 74 cm and hips 99 cm. Uniqlo says its letter sizes can fit differently from item to item, and the evidence reviewed gives no fixed UK-numeric equivalent. Check the specific item's chart.

Should I size up or down at Uniqlo?

There is no single rule. Uniqlo says fit depends on each item's design (regular, slim, relaxed or oversized). Read the product measurements and the fit type, and compare them with a garment you already own that fits well. Sizing up or down only makes sense for a given item.

Do I measure my body or the garment before ordering?

Do both where you can. Next's charts are built on body measurements, so measure bust, waist, hips and height. Next's chart does not describe how roomy a style is, so garment measurements help with ease. At Uniqlo, start with the item's garment measurements and fit type.

Does vanity sizing affect Uniqlo and Next?

Reports show that labels vary between brands. A 2014 Racked comparison, reported by Refinery29, found Uniqlo's size-8 jeans ran large. Marie Claire reported variation between UK stores in 2010. Neither source measured Next, and both are dated, so compare your own measurements with the current chart rather than relying on the label.

Sources

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