CLOTHING SIZE FINDER PRO · FOR FASHION RETAILERS
35% lower return rate on recommended sizes
On average, a 35% lower return rate for shoppers who ordered exactly the size we recommended, compared with shoppers who did not use Size Finder.
Predictive sizing trained on your own sales, returns and reviews. Any platform, with a dedicated account manager.
Min. +3% overall conversion
Lowest impact we have ever seen
50%+ of sales get size advice
Pro version
~3-week deployment
Average time to go live
Any platform
Full API access
THE PROBLEM
Why size returns keep happening
Size refunds and bracketing eat margin, and most tools never prove they help.
Bracketing
Unsure of their size, shoppers order several and send the rest back.
Static size charts
Charts ignore how each product really fits. We use real purchases and returns.
Hidden results
Most tools hide whether shoppers follow their advice. We show it.
HOW IT WORKS
Live from day 1, in three steps
Zero input for known shoppers from launch day, one short quiz for new ones.
01
Connect your data
We ingest up to 24 months of your sales and refunds data. Less history works too.
02
Day 1: instant size, zero input
From launch day, known shoppers get an instant size from their past purchases, via their user ID. No quiz.
03
New shoppers: one short quiz
New shoppers fill in a short quiz once. After that, they are remembered.
THE ONE-TIME QUIZ
Personal info
Body shape
Fit preference
RESULTS
35%
On average, a 35% lower return rate for shoppers who ordered exactly the size we recommended, compared with shoppers who did not use Size Finder.
+3%
Minimum overall conversion uplift: the lowest impact we have ever seen
50%+
Of sales get size advice (Pro)
Impact varies by category, data quality, and adoption.
INSIDE PRO
What’s inside Size Finder Pro
Predictive AI models
Sizes down to Product ID and Colour ID, from purchases, returns and behaviour.
Smart size matching
Groups similar shoppers and similar-fitting products to size newly launched collections.
Review analysis (LLMs)
Finds fit insights like tight sleeves or fabric stretch in reviews. No manual tagging.
Dynamic fit messaging
Tells shoppers to size up, size down or stay, before checkout.
Size-demand dashboard
Size uptake, return rates, conversion uplift and true size demand, incl. stock-out losses.
Alternative products
Size out of stock? Suggests similar in-stock items in the shopper’s size.
PROOF
What retailers say
“We have been able to customise the platform to suit our needs and no ask is ever too much.”
Rosie · Head of e-commerce and brand (UK)
“The tool allows us to offer accurate fitting information to our customers…”
Anna · Digital Director (UK)
“Our cooperation with Prime AI is very successful, we are happy with the results.”
Denis · Performance Marketing Manager (Romania)
CASE STUDIES
WORKS WITH
Works with the rest of Prime AI
Size advice and try-on in one widget, on a similar body type or the shopper’s photo.
Spots serial returners, wardrobers and bracketers behind guest checkouts.
The Persistent Device ID API is used for fraud prevention only. Size recommendations never use it.
INTEGRATION
Integration
- Before launch, we ingest up to 24 months of sales and refunds data (less works too)
- ~3-week average go-live, depending on customisation
- Any platform: Shopify Plus, Salesforce, Adobe Commerce, SAP, custom sites and apps
- Full API access for CRM, ERP and loyalty systems
- All categories, no limits on brands or SKUs
Smaller Shopify store? Try Clothing Size Finder Lite on the Shopify App Store →
FAQ
Questions retailers ask
Your site passes us the shopper’s user ID. From day 1 of launch, they instantly get a size recommendation based on their past purchases, with no quiz needed.
No. New shoppers fill in the short quiz once, and they are remembered after that.
To enable zero-input sizing, we first ingest your last 24 months of sales and refunds data. Less history also works.
Any platform, including Shopify Plus, WooCommerce, Salesforce Commerce Cloud, Adobe Commerce (Magento), SAP Commerce Cloud, custom-built websites and mobile apps.
Average deployment time is around 3 weeks, depending on the level of customisation.
Yes. From a few simple answers, Size Finder predicts chest, waist, hips, inseam, shoulder width and more, for made-to-measure clothing and virtual try-on. See AI-predicted body dimensions.
See it on your own catalogue
See how Size Finder Pro would work with your data and platform.