# 'In between sizes? Size down' tip on product pages: +4.5% conversion

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Variant, size & option selectors, Headlines, product titles & copy
- Test run by: [Visually](https://liftarchive.com/practitioners/visually/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://143410811.hs-sites-eu1.com/branch-0
- Page: https://liftarchive.com/test/the-perfect-jean-size-down-tip/

The Perfect Jean added a short sizing tip to its product pages telling in-between shoppers to size down, and conversion rate rose 4.5%. The denim brand ran the test with Visually, which suggested the tip and published the result as a case study. The tip is now on all of the brand's product pages.

## Result

**+4.5% conversion**

- Conversion rate: +4.5% with the size tip.
- The tip became a permanent part of all product pages.
- Sample size, test length and confidence were not reported, and no return rate data was shared.

## Control

Product pages had a size guide, plus photos and descriptions of fit. There was no direct advice for shoppers between sizes.

## Variant

A short tip was added: "Not sure / in between sizes? We suggest sizing down".

## Why it likely won (our reading)

- Most shoppers know their size. The ones who stall are those stuck between two sizes.
- A single clear recommendation removes a decision, while a size chart still leaves the shopper to work it out.
- Stretch denim makes sizing down a safe tip, so the advice is likely to fit.

## Caveats

Visually published this as a case study and did not share sample size, test length or confidence level. The effect on returns and exchanges was not reported.

## How to run this test

- Hypothesis: If we add a one-line tip telling in-between shoppers which way to size, then more will buy because they won't stall on choosing between two sizes.
- Primary metric: Conversion rate
- Guardrail: Return and exchange rate for fit
- Guardrail: Size distribution of orders
- Guardrail: Revenue per visitor
- Who should test it: Apparel and footwear stores where fit follows a clear pattern, such as stretch fabrics that run large. Only give the tip if your return data supports it, or you may increase fit returns.

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Credit: Visually ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/the-perfect-jean-size-down-tip/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.