"M or L?"
Faced with two sizes, some shoppers close the tab. Others order both and send one back.
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Fashion · The guideSize recommendation.
How size recommendation software calculates each shopper's size in your own size chart, no photo needed, and how to choose the right tool.
- 3 approaches compared
- 6 questions before you install
- Shopify, PrestaShop, WooCommerce
In brief
What is size recommendation in e-commerce?
It is a tool placed on the product page, next to the size selector, that gives each shopper their size for that specific product. They answer a few questions they already know; the tool does the calculation in the product's size chart.
The problem
Why a size chart is not enough.
Your size chart is accurate, but your shoppers do not know their body measurements. They want an answer, not a table.
The return
A parcel coming back, an item to restock, a refund, and often a lost order.
What returns really cost: read our guide to fashion e-commerce return rates and our article on e-commerce returns.
How it works
From a few answers to a size, in 4 steps.
- 1
The profile
Gender, height, weight and age. Nothing to measure.
- 2
Body shape
Upper body, stomach, hips: the shopper picks the image that looks most like them.
- 3
14 measurements
The WeeFizz engine derives 14 girth and length measurements.
- 4
The size, in your chart
These measurements are compared with the product's size chart, taking the garment's ease into account.
Key point: size recommendation works with no photo needed. Virtual try-on uses a photo, but the size is still calculated by the recommendation. The difference is explained in virtual try-on or size recommendation?
Comparison
Size chart, fit quiz or real recommendation?
Three approaches exist. They do not ask the shopper for the same thing and do not give them the same answer.
| Size chart | Fit quiz | Size recommendation | |
|---|---|---|---|
| What the shopper does | Measures themselves with a tape measure, then reads the chart | Answers questions about the sizes they usually wear | Answers a few questions they already know |
| What they get | Centimetres to interpret alone | An indication, based on the quiz rules | A size, calculated in the product's size chart |
| Between two sizes | "M or L?" stays unanswered | Depends on the questions asked | Body shape and the garment's ease decide |
| Per product | One chart per product or per collection | Often one shared rule | The size chart of each product |
| What you learn | Nothing | Varies by tool | Usage, recommended sizes, conversion, per product |
The size chart remains the starting point. The engine is explained in detail in our expertise on body shape and ease.
Buyer's guide
Choosing size recommendation software: 6 questions.
They apply to WeeFizz as much as to any other size recommendation tool. Ask them before you install.
1. A size or a table?
A table, however well designed, leaves the calculation to the shopper.
2. Based on which chart?
Your size chart, product by product, not a generic one.
3. What is the shopper asked for?
A tape measure, a photo or a few answers: every extra step makes some shoppers give up.
4. What will you be able to measure?
Without usage and conversion analytics, you cannot know whether the tool pays off.
5. Where does the data go?
Hosting, GDPR, consent for e-mail addresses: demand precise answers.
6. Can you test it for real?
A trial on your own catalogue, with your own figures, is worth more than a generic demo.
- WeeFizz's answers. Your own size chart, no photo or tape measure, analytics per product, hosting in the European Union and a 14-day free trial with no commitment. Plans and prices are on the pricing page.
Integrations
On your platform, in a few minutes.
The same "Find my size" widget and the same WeeFizz dashboard, whatever your platform. Looking for a size advisor on Shopify, PrestaShop or WooCommerce? Choose your installation guide.
ShopifyOfficial app on the Shopify App Store
PrestaShopModule from PrestaShop 1.7
WooCommerceWordPress plugin
Custom site? The JavaScript SDK adds the same widget. Plans and the free trial are on the pricing page; the demo is on the WeeFizz Fashion page.
Frequently asked questions
Size recommendation: your questions.
What is size recommendation in e-commerce?
It is a tool placed on the product page that gives each shopper their size for that specific product. Instead of reading a table of centimetres on their own, they answer a few questions and get a size, calculated in the product's size chart, before adding to basket.
Does the shopper need to send a photo or measure themselves?
No. With WeeFizz, they enter their gender, height, weight and age, then choose their body shape from images. No photo, no tape measure. Virtual try-on, which uses a photo, is a separate service: the size itself is still calculated without a photo.
How is the size calculated?
The shopper's answers become 14 girth and length measurements. These measurements are compared with the product's size chart, set up as it is and calibrated by WeeFizz, taking the garment's ease into account. Jeans, a hoodie and a dress each keep their own chart.
How is it different from a standard size chart?
A size chart gives centimetres that shoppers must compare with their own body measurements, which they rarely know. Size recommendation does that calculation for them, from the same size chart, and gives them one answer: a size.
Which platforms can it be installed on?
WeeFizz Fashion is available as a Shopify app (WeeFizz Size Recommender), a PrestaShop module, a WooCommerce plugin and a JavaScript SDK for custom sites. The widget and the WeeFizz dashboard are the same everywhere.
Does size recommendation remove all returns?
No. A recommendation is the best possible estimate based on the size chart provided. It reduces hesitation, but no serious tool promises zero errors. The right approach: measure the effect on your own store, with your own figures.
How can I test it before committing?
Every WeeFizz Fashion plan starts with a 14-day free trial, with no commitment. You install the widget on your catalogue and follow, in your dashboard, widget usage, recommended sizes and conversion, product by product.
Equipping employees rather than online shoppers? Read our guide to remote workwear sizing.
WeeFizz Fashion
The right size, in your size chart, before the order.
Try size recommendation on your catalogue for 14 days, with no commitment.