AI Size Recommendation for Fashion Stores: Cut Wrong-Size Orders
By the ZeDaq.ai team · · 4 min read
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AI size recommendation tells each shopper which size to buy from your own size chart, based on their measured body, not a guess. With ZeDaq.ai, the shopper uploads one photo and enters their height. The AI reads 33 body landmarks, estimates their measurements and matches them to your chart in about 30 seconds.
Try it below, then see how to add it to your store.
Run the 30-second size scan
Why don't size charts stop wrong-size orders?
A size chart only works if the shopper knows their measurements. Most don't, and few own a tape measure. So they:
- guess from the size they wear at another brand, even though sizes vary between brands;
- order two sizes and return one;
- message your support team asking "what size am I?";
- or leave without buying.
Each of these costs you margin, support time or a sale. Our guide on why online clothing sizes vary so much between brands explains the cause.
How does AI size recommendation work?
- Capture: the shopper uploads one photo and enters their height.
- Landmarks: the AI finds 33 skeletal points — shoulders, elbows, hips, knees and so on.
- Calibration: height turns pixel distances into real measurements.
- Matching: measurements are compared with your size chart, including alpha sizes (S, M, L) and numeric sizes.
- Recommendation: the shopper sees their suggested size on the product page, and can see the garment on themselves with virtual try-on.
What types of size recommendation tool are there?
| Method | Input from shopper | Strength | Weakness |
|---|---|---|---|
| Static size chart | Their own measurements | Free, simple | Most shoppers don't know their measurements |
| Fit quiz | Height, weight, usual size, body shape | Quick | Self-reported, often inaccurate |
| Purchase-history models | Past orders and returns | Strong for big brands | Needs lots of data; weak for new customers |
| Photo body scan | One photo + height | Real measurements, works for first-time buyers | Loose clothing can shift circumference estimates |
How accurate is a photo-based size scan?
Accuracy varies by measurement. Lengths such as shoulder width, sleeve length and inseam are the most reliable, because they come straight from landmark distances. Circumferences such as chest, waist and hips can move if the shopper wears loose clothing in the photo.
To get the best results:
- ask shoppers to wear fitted clothing and stand straight, facing the camera;
- keep your size chart accurate and garment-specific, not one chart for everything;
- add fit notes ("runs small", "relaxed fit") to product pages.
Read more in AI body sizing explained.
How do you add size recommendation to your store?
Shopify: install ZeDaq.ai, switch on the app embed in Theme Editor, then add your size chart in the app.
WooCommerce, Wix, Magento or custom: create a free account, paste the script tag into your product page template, and add your size chart in the dashboard.
Own app or headless store: call the REST API. See the virtual try-on API guide.
What does it cost?
Size lookups are free on ZeDaq.ai and don't count against your try-on or measurement caps. Body scans count as measurements.
| Plan | Monthly | Measurements | Try-ons |
|---|---|---|---|
| Free (web) | $0 | 3 | 3 |
| Micro | $14 | 30 | 20 |
| Starter | $49 | 100 | 75 |
| Growth | $129 | Unlimited | 650 |
| Scale | $299 | Unlimited | 2,000 |
Checked 6 November 2026 on zedaq.ai/pricing.
How do you know it's working?
Track these for 30 days before and after launch, on the same products:
- share of returns tagged "too small" or "too large";
- "what size am I?" messages to support;
- conversion rate on product pages;
- orders containing two sizes of the same item.
Our guide on fit-related returns shows how to tag return reasons.
Frequently asked questions
Does the shopper need a tape measure or A4 paper?
Not for the product-page scan. One photo and height are enough. ZeDaq.ai's tailor measurement links use a higher-precision two-photo mode.
Does it work with my own size chart?
Yes. Recommendations come from the chart you enter, so they match your brand's fit.
Is the shopper's photo stored?
See the ZeDaq.ai privacy policy and our guide on what to tell shoppers about try-on privacy.
Can I use size recommendation without virtual try-on?
Both are part of the same widget and subscription. You can decide where each appears on your product pages.
See your size in 30 seconds
Internal links: Virtual fitting room for clothing websites · How to write size guides that reduce returns · How to add virtual try-on to Shopify
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Virtual try-on and Find my size for your store, plus client, order and invoicing tools for tailors, in one subscription.
