Princess Polly's 4% Sales Lift: The One Checkout Move That Worked
A fast-fashion retailer tested authenticated checkout and saw conversion jump 4.1% for returning buyers. Here's what that move was, and why it matters for your checkout flow.
WebKing Intelligence Desk//Monitored live
Princess Polly, a fast-fashion retailer, tested one specific change to its checkout experience and recorded a 4.1% conversion increase for returning customers with an active authenticated session. The move: enabling pre-filled checkout for logged-in buyers.
What the Lift Actually Was
The retailer's returning customers who were already logged into their account saw their payment method and shipping address appear on the checkout page without re-entry. Instead of typing six form fields, they clicked confirm. Friction dropped. Conversion climbed 4.1%.
This is not a redesign. It's not a new feature. It's a behavioral shift in how checkout treats a segment that already knows you. And it moved the needle.
Why Repeat Customers Matter
Repeat buyers carry higher intent and lower abandonment risk than first-timers. But they also carry impatience. They've bought before. They don't want to re-prove who they are at the register. When you remove that step, they move faster.
Princess Polly isolated this segment and measured them separately. That precision is why the 4.1% lift is reliable: it's tied to a known behavior, not a platform-wide guess.
The Playbook for Your Store
Segment your repeat customers in your checkout analytics
Measure how many currently abandon at payment or address entry
Test authenticated checkout for that segment only
Run the test for 2-4 weeks and compare conversion to the control group
If you see lift, roll it out to all returning customers
