Measuring the return on influencer marketing is one of the most contested questions in fashion brand marketing. The brands that claim it doesn't work are usually measuring it wrong. The brands that claim every partnership is successful are usually measuring it conveniently.
The Problem With Last-Click Attribution
Most fashion brands measure influencer ROI through discount codes and affiliate links. The logic is clean: if the link got clicked and the code got used, the partnership worked. If it didn't, it didn't.
This is an accurate measurement of one thing: direct response. It is not a measurement of what influencer marketing primarily does, which is awareness, consideration, and brand building that shows up in other channels' conversion data.
A customer who sees a brand featured by a creator they trust, searches for the brand three days later, and buys through organic search does not show up in the influencer's attribution. They show up in the organic channel's attribution. The influencer's code registers zero conversions. The partnership looks like a failure. It was the reason the sale happened.
What Better Measurement Looks Like
Measuring influencer impact accurately requires looking at the full picture — brand search volume around the campaign period, new visitor traffic, social follower growth, and changes in conversion rate for new audiences during and after the campaign.
It also requires setting the right objectives before the campaign runs. If the objective is brand awareness, measure brand awareness. If it's conversion, structure the campaign and the measurement for conversion from the start.
Influencer marketing is not unmeasurable. It requires measurement frameworks that match what the activity actually does.