Rendered Fits · Original research
AI fashion shopping statistics: size charts in 829 Shopify stores
In our research sample of 829 Shopify fashion stores, 31.6% had a size chart our scanner could read as page text. This measures published size information, not how many people use AI shopping assistants or how accurately an assistant recommends a size.
By the Rendered Fits team · Updated 6 October 2026 · Data collected 24 September 2026
What did the Shopify size chart scan measure?
The scan covered 829 stores with clothing sizes and 107,138 sized products. It checked whether size-chart information was available to our scanner as page text; 262 stores had a readable chart.
A chart in an image, a login or a script-dependent interface may have escaped the scanner. A store recorded without a readable chart may still have a size chart for human visitors. Read the full sampling and scan method before using the result.
Does a readable chart prove an AI assistant can choose the right size?
No. Readable information gives a shopper or assistant evidence to consult, but this scan did not test physical fit, recommendation accuracy or purchase outcomes.
Product-specific body or garment measurements, units, size labels and cut notes need to be clear. The size-chart checklist shows what to prepare; the sizing guide explains the limits of a recommendation.
Can these figures describe all Shopify stores or AI shopping adoption?
No. This was a non-random research sample, and the 31.6% figure applies to the 829 sampled stores. It does not estimate global Shopify coverage, assistant usage or a reduction in returns.
For a buying decision, check the information published for your own products and test whether the recommendation follows the relevant chart. Use separate evidence for shopper adoption or merchant outcomes.
Where can I verify or cite the findings?
The Shopify Size Chart Report 2026 publishes aggregate measures, method and limitations. Its CSV, JSON summary and citation file are available without signup.
Suggested attribution: Rendered Fits, Shopify Size Chart Report 2026, data collected 24 September 2026; non-random sample of 829 stores and 107,138 sized products.
About Rendered Fits. Rendered Fits is a Shopify app for fashion brands that recommends a size for supported products from the brand's own size chart, and can show shoppers an optional AI try-on preview. There is a Free plan, and Complete is $349 a month with a 14-day trial.
How can a fashion team check its own store?
Run the free size-chart audit, then compare its findings with what a shopper sees on representative product pages. Confirm which measurements the chart describes and test different product cuts and size labels.
Use the AI agent fit check to inspect published sizing information, and the measurement worksheet to define what you will observe. Keep chart readability, recommendation accuracy and mature returns as separate questions.