Size Recommendation for Plus-Size Stores

Size recommendation for plus-size stores works best when the tool matches each shopper to your own extended size chart and picks the size that fits their largest measurement. A generic chart that stops at XL, or a tool that averages measurements, will send curvy shoppers the wrong size.

This guide covers how to build a chart that reflects your range, how a body scan handles curves, and how to test it before shoppers rely on it. For the basics of how scan-based sizing works, read the main guide to AI size recommendation for fashion stores.

Why is plus-size sizing harder to recommend?

Plus-size bodies vary more in proportion than a straight-size chart assumes. Two shoppers with the same bust can have very different waist and hip measurements.

That creates three common problems:

• One measurement doesn't predict the rest. A size picked from bust alone can be tight at the hips.
• Brand labels don't agree. A 2X at one label can be an 18 at another and a 20 at a third.
• Charts often stop too early. If the chart ends at 3X, a shopper above it gets no useful answer.

A good size tool has to handle all three.

How does a body scan size a curvy shopper?

With ZeDaq.ai, the shopper taps Find my size, uploads one photo and enters their height. The 30-second scan estimates their measurements and matches them to your size chart for that garment type.

When the measurements point to different sizes, the scan recommends the size that fits the largest relevant measurement. On a dress, a shopper whose bust says 18 and whose hips say 20 gets a 20. A slightly loose garment can be worn or taken in, while a tight one is much harder to fix.

The shopper doesn't need a tape measure or an account. The scan runs on your product page.

How do you build an extended size chart?

You add your chart in Dashboard → Size charts, or in the Shopify app. Each garment type gets its own chart: tops, outerwear, dresses and bottoms.

Follow these steps for a plus-size range:

1. Start from your pattern grading. Use the body measurements each size was designed for, not the garment's flat width.
2. Include every size you sell. If you go to 6X, the chart goes to 6X.
3. Use your own labels. Enter 1X to 6X, or 14 to 32, exactly as your product pages show them.
4. Make ranges meet. If 2X ends at 117 cm bust, 3X should start at 117 cm.
5. Add hips to bottoms and dresses. Hips decide fit on many plus-size bottoms.

Here is an example of the format. It is an example chart only, so check your brand's own chart before you copy any numbers.

Size	Bust (cm)	Waist (cm)	Hips (cm)
1X	107 to 112	92 to 97	115 to 120
2X	112 to 117	97 to 104	120 to 127
3X	117 to 125	104 to 112	127 to 135
4X	125 to 133	112 to 120	135 to 143

If you skip the chart, the scan uses a generic UK, US, EU or AU chart. That works for a quick test, but it won't use your labels, and it may not match how your range is cut.

Which garment types need separate charts?

Plus-size fit changes a lot between categories, so separate charts matter more here than in straight sizing.

Garment type	Measurements that usually decide fit
Tops	Bust, and upper arm on fitted sleeves
Outerwear	Bust, with room for layers underneath
Dresses	Bust, waist and hips together
Bottoms	Waist and hips

If a coat is cut with extra room, give outerwear its own chart instead of reusing the tops chart. Otherwise shoppers may be told to size up when they don't need to.

How do you test recommendations before launch?

Test with real bodies from across your range, not only your sample size.

1. Find four or five people who wear different sizes in your range, including your largest.
2. Note the size each one wears in a few key products.
3. Run each person through Find my size on those products.
4. Compare the results. If the scan says 3X and the person wears 2X in your brand, check the 2X and 3X ranges.
5. Repeat after any change. A small range change can shift results for several sizes.

Activewear and menswear raise similar range questions. The guides to sizing for activewear brands and size recommendation for menswear cover stretch fabrics and suit sizing.

What are the most common chart mistakes in plus-size ranges?

Most wrong recommendations trace back to the chart, not the scan. Check yours for these before launch.

• Copying a straight-size chart and adding steps. Plus-size grading often changes the gap between sizes. Use the grading your pattern maker actually used.
• Leaving out hips on dresses. A dress chart with bust only will size many pear-shaped shoppers too small.
• Mixing garment and body measurements. A flat garment width of 60 cm is not a 60 cm body. Keep the chart to body measurements.
• Mixing units. Pick centimeters or inches for each chart and stay with it.
• Forgetting outerwear. A coat chart copied from tops can push shoppers up a size they don't need.
• Not updating after a re-cut. If a new season changes the fit, update the ranges the same week.

Fix one mistake at a time and retest. Then you can see which change made the difference.

What should your product pages say?

A recommendation is easier to trust when the page around it is clear.

• Show the model's size and height on every product.
• Describe the cut in plain words, such as "relaxed through the hips" or "fitted at the waist."
• Note stretch. Say whether a fabric has stretch, because it changes how a size feels.
• Use body-neutral language. Describe the garment, not the shopper's body.

Shoppers who want covered, loose styles have their own needs. If you also sell longer and fuller cuts, the guide to sizing for modest fashion stores explains how coverage changes the chart.

How much does it cost to add size recommendation?

Each scan uses one measurement from your plan. ZeDaq.ai's Free plan costs $0 and includes 3 try-ons and 3 measurements a month, which is enough to test your chart.

Paid plans are Micro at $14 a month, Starter at $49, Growth at $129 and Scale at $299. Every paid plan has a 3-day free trial with no card required. Check the current plan limits before you choose.

FAQs

Can I use labels like 1X to 6X?

Yes. You enter your own labels in the size chart, and the scan recommends them exactly as you entered them.

What if a shopper is above my largest size?

Their largest measurement will fall outside your chart. Add your full range so the scan has a size to recommend, and note your largest size clearly on the page.

Does the shopper need to share their weight?

No. The scan uses one photo and the shopper's height.

Can tops and bottoms use different charts?

Yes. Each garment type has its own chart, so tops can use bust while bottoms use waist and hips.