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Testing Fit Feedback Votes on a Fashion Product Page

“Runs small,” “true to size,” or “runs large” feedback may give shoppers another reference when choosing a size.

  • Product page
  • Size-related return rate

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
Product page
Difference
added

Hypothesis

A summary may help prevent a poor choice, but its value depends on the responses behind it. Allow enough time for returns to mature and check whether the variant changes who buys.

How to run this test

Primary metric

Size-related return rate

Compare size-related returns for orders that have completed the same follow-up period in each arm; read this conditional rate alongside purchase conversion and product mix.

Other metrics

  • Purchase conversion rate (CR)Check whether the mix of purchasers changes alongside returns.
  • Size chart open rateSee whether fit feedback changes use of the size chart.
  • Add-to-cart rateTrack any material drop in add-to-cart.
  • Customer service contactsTrack size-related contacts relative to traffic or purchases.

What to check before and during the test

  • SummaryAdd a predefined fit summary based on real responses.
  • Placement and formatSet the summary's placement and presentation before the test.
  • Data thresholdSet and maintain a justified minimum response count.
  • Repeated displayDo not add a second display at size selection in this comparison.
  • CategoryReview apparel categories separately.

Setup mistakes to avoid

  1. 1Do not show percentages based on very few responses.
  2. 2Do not require visitors to provide feedback before choosing a size.
  3. 3Do not change the fit summary and size chart together.
  4. 4Do not round results in the product's favor.
  5. 5Keep the return policy unchanged throughout the test.