What a Women's Size Chart Really Is
A women's size chart is a table that links a size label, such as 10 or medium, to a set of measurements. There is no universal standard behind it. Each brand decides its own base size, its own steps between sizes and its own fit, so a size 12 from one label can be a size 10 from another. For a buyer, the chart is a business decision, not a fact of nature.
This is why the women's size chart is the first document to settle in any womenswear programme. It drives the pattern, the grading, the sample approval and the return rate. A chart that matches your customer reduces returns, while a chart copied from another brand often fails because the customer is different.
Before building a chart, read our guides to garment points of measure and garment grading, because they explain where each number comes from.
UK, US and EU Sizes in a Women's Size Chart
A global women's size chart usually shows several size systems side by side. UK sizes are numeric and run in steps of two, such as 8, 10 and 12. US sizes sit about four numbers below the UK size, so a UK 12 is often a US 8. EU sizes sit about twenty-eight above the UK size, so a UK 12 is often an EU 40.
These conversions are rules of thumb, not guarantees. Brands in each region still set their own measurements, and vanity sizing means that the same body can wear a smaller number than it did years ago. Our UK clothing size chart guide covers the British system in more detail.
Illustrative women's size chart with body measurements in centimetres
| UK size | US / EU | Bust | Waist | Hip |
|---|---|---|---|---|
| 8 | US 4 / EU 36 | 82 to 85 | 64 to 67 | 89 to 92 |
| 10 | US 6 / EU 38 | 87 to 90 | 69 to 72 | 94 to 97 |
| 12 | US 8 / EU 40 | 92 to 95 | 74 to 77 | 99 to 102 |
| 14 | US 10 / EU 42 | 97 to 100 | 79 to 82 | 104 to 107 |
| 16 | US 12 / EU 44 | 102 to 106 | 84 to 88 | 109 to 113 |
| 18 | US 14 / EU 46 | 108 to 112 | 90 to 94 | 115 to 119 |
A general illustration only. Brands set their own charts, so always agree measurements for your own customer and approve them on a sample.
Body Measurements Are Not Garment Measurements
The most common mistake in a women's size chart is mixing two kinds of number. Body measurements describe the person. Garment measurements describe the finished product, and they include ease, which is the extra room that lets the wearer move. A fitted dress may have only a few centimetres of ease at the bust, while an oversized shirt may have twenty or more.
Always state which kind of number you are showing. Customers read body measurements to choose a size, and factories need garment measurements to cut and check the product. Publishing both is the most helpful approach, and it reduces fit-related returns. Our guide to reducing garment returns explains why.
Typical ease added to bust measurement by fit, in centimetres (illustrative ranges)
Ease over the body bust measurement
Illustrative ranges for explanation only. Real ease depends on fabric, style and customer, so set it in your own spec.
How Grading Builds the Rest of the Size Range
Once a base size is approved, the factory grades the pattern up and down. Grading adds or removes a fixed amount at each point of measure between sizes. In a typical women's size chart, bust, waist and hip grow by roughly four to five centimetres per size, though length and sleeve change by less.
Grading is not just arithmetic. Larger sizes may need changes to proportion, such as a lower bust point or a longer back, so a plain scale-up can look wrong. Ask your factory how it handles this, and request fit samples in at least one smaller and one larger size before bulk. Our grading guide shows each step.
A route from base size to a full women's size chart
- 1Choose a base sizeOften UK 10 or 12, matching your core customer
- 2Approve the base sampleFit and measurements signed off
- 3Set grade rulesIncrements agreed for each point of measure
- 4Grade the patternSizes created from the approved base
- 5Test the extremesSmallest and largest sizes sampled for fit
A simplified sequence. Real routes vary between factories and garment types.
How Fabric Changes What a Size Chart Can Do
The same women's size chart cannot serve every fabric. Stretch knits forgive small errors in measurement, while stiff wovens do not. A jersey top graded in steps of two sizes may fit comfortably, while a woven shirt in the same chart may gape or pull. For rigid fabrics, brands often add more sizes or use tighter increments.
Fabric behaviour after washing also matters. Cotton and viscose can shrink, which changes finished measurements. State the size spec for the finished garment after wash, and test shrinkage on swatches before cutting. Our garment testing guide explains the checks.
How fabric type affects size chart accuracy
1 dot = low, 5 dots = high
| Forgives small errors | Needs tight tolerances | Needs shrinkage allowance | Works with fewer sizes | |
|---|---|---|---|---|
| Stretch jersey | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Rib knit | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Cotton woven | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Viscose woven | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Stretch denim | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
Indicative ratings based on how each fabric usually behaves, not laboratory results.
Tolerances: How Close Is Close Enough?
A size chart is only useful if the factory knows how far a garment may drift from it. A tolerance states the acceptable plus or minus on each measurement. Bust and hip tolerances are usually tighter than length, and tolerances for knits are usually wider than for wovens. Without agreed tolerances, every disagreement becomes an argument.
Write tolerances into the tech pack and attach them to the chart. Our measurement tolerance guide gives starting points, and the same document should say how measurements are taken, for example flat on a table with the garment relaxed.
Where fit-related returns tend to come from (worked example)
Worked example, not an industry average
- Size label does not match body32%
- Fabric shrinkage or stretch20%
- Length or proportion24%
- Quality of measurements on bulk14%
- Customer changed mind10%
An illustrative split for explanation only. Real return reasons depend on product, customer and channel, so use it as a prompt to look at your own data.
Setting a Women's Size Chart for a New Range
Start with the customer, not the competitor. Look at who buys, what size they usually order and which sizes sell out. A brand aimed at petite customers needs a different chart from one aimed at tall customers, and a size run of 6 to 16 serves a different market from 14 to 28. Decide the range first, then fix the chart.
Next decide how many sizes to produce. Ratios across sizes affect minimum quantities, stock risk and sell-through, so talk to your factory early. Our guides on size ratios for a first order and women's clothing manufacturing help you plan this stage.
What to define when setting a women's size chart
- Size range and the base size for sampling
- Size labels in every market you sell to
- Body measurements for customer information
- Garment measurements for every point of measure
- Grade rules between each size
- Tolerances for each measurement
- Fabric shrinkage allowance
- Fit model or fit mannequin used for approval
A general checklist. Add anything your retailer or sales channel requires.
Common Size Chart Problems and How to Avoid Them
The most common problems are copying another brand's chart, changing the chart between seasons without telling the factory and publishing a chart that does not match the garment. Each one drives returns and bad reviews. Keep one master chart, version it and send every revision to the factory in writing.
Another problem is relying on a single fit model. A model with unusual proportions can lead the factory to adjust the pattern in ways that do not suit your customers. Use a fit model whose measurements match your base size, and confirm the sample on a second body if you can.
Few sizes vs many sizes in a first range
Strengths
- Few sizes: lower sampling and stock cost
- Few sizes: easier to forecast and reorder
- Many sizes: serves more customers
- Many sizes: can lift conversion and cut returns
Limits
- Few sizes: some customers cannot find a fit
- Few sizes: higher return risk on odd sizes
- Many sizes: more stock risk per style
- Many sizes: more grading and fit work
A general comparison. The right balance depends on your customer, budget and channel.
Questions to Ask a Factory About Your Size Chart
A good factory will question your chart before sampling begins. It will check whether measurements are consistent, whether grading looks sensible and whether the points of measure are clear. Treat these questions as a sign of care, not delay.
Ask the factory how it records measurements on bulk, how it handles out-of-tolerance garments and who is responsible for correcting them. The answers show how much control it has over its own production.
Questions that help you test a factory's sizing control
| Question | Why it matters | A good answer sounds like |
|---|---|---|
| How do you check measurements on bulk? | Chart accuracy depends on inspection | Sampling plan with a measurement sheet per lot |
| How do you handle shrinkage? | Finished size must match the chart | Fabric tested and allowance applied to the pattern |
| Can you grade from our base size? | Grading affects fit across the range | Yes, with a written grade rule sheet |
| Will you sample the smallest and largest sizes? | Extremes expose grading problems | Size set samples before bulk |
| What happens if bulk is out of tolerance? | Clear remedies prevent disputes | Rework, replacement or a documented agreement |
A general question list. Adapt it to your own style and market.
Common Mistakes When Using a Women's Size Chart
The first mistake is publishing a chart that was never tested on bulk garments. A chart is a promise to the customer, so check a sample of finished garments against it before the page goes live. If the numbers drift, correct the chart or the pattern, and do not leave the two disagreeing.
The second mistake is ignoring stretch. A jersey dress may be labelled as fitting a wide range of bust sizes, but the stretch has limits and the fabric recovers differently after wear. State the stretch range plainly in your product notes and let the factory test recovery on the actual fabric before sign-off.
The third mistake is leaving sizing to the last stage. Because the chart affects pattern work, fabric consumption and packing, changing it late forces rework. Settle it early, share it in the tech pack and keep a signed copy. For reference, ASTM International publishes sizing standards used in some markets, which can help when you are building a chart from scratch.
How Ruhrose Helps With Size Charts and Grading
Ruhrose develops womenswear, jersey, fleece and woven casualwear with production in Bangladesh and buyer support in the UK. We start from your size chart or reference garment, check measurements and grading, build fit samples and agree tolerances before bulk. We do not publish prices or minimums here, because they depend on style and quantity. The ISO publishes standards that are widely used in textile testing and sizing work. To discuss your range, visit Ruhrose and tell us what you are planning.