In fashion, exclusion logic matters more than timing
Everywhere else on this site the interesting question is when to ask. In fashion the interesting question is whom not to ask.
Return rates in online fashion routinely run at a third of orders and can go higher on certain categories. That is not a failure — it is how the category works, because buyers order two sizes intending to send one back. It does mean that a naive automation asking every buyer for a review is, a third of the time, asking someone who has just sent your product back.
The review you get from that buyer is not about your service. It is about the item that did not fit. And it lands on your listing.
Any automation worth running in fashion excludes orders with an open return, a refund or a complaint before it sends anything. Merita does that as a default rather than as an option, and in this category it is most of the value.
Partial returns are the case that catches people out
The harder version: a buyer orders three items, keeps one and returns two. The order is not cancelled, it is not fully refunded, and a simple rule sees a delivered order with a happy ending.
The buyer's actual experience was that two of three things were wrong. Ask them for a review of the order and you will not enjoy it. Handling the partial case properly is the difference between an automation that helps and one that quietly costs you a star.
Sizing is what fashion reviews are actually for
Read any fashion review section and the pattern is immediate: buyers are not reviewing quality nearly as much as they are reviewing fit. Runs small. Sleeves long. True to size if you are between two.
That is the most commercially valuable information on the page, because it is the thing that stops the next buyer ordering the wrong size and returning it. Reviews in fashion do not just win you sales, they lower your return rate — which in a category with structural returns is worth more than the sales.
What Merita does
We wait for delivery, exclude anything with a return, refund or complaint attached including partial returns, and send one message in French through La Redoute's own buyer messaging asking for an honest review. Nothing offered in return, one message per order.