How to Write Fit Notes on Shopify Product Pages to Cut Size Returns

A shopper finds a linen dress she loves, checks the size chart and sees her size. She still cannot tell whether it runs small, so she orders two sizes and sends one back.

A fit note is a one- or two-sentence line on a product page that says how this piece fits in practice, beyond its measurements. Return is the stage this guide fixes: it tracks the share of orders sent back, and size or fit is the most common reason. Fewer wrong-size orders mean more of the sales you have already won are kept.

This guide is about the written fit note. For the measurement chart, read How to Add a Size Guide for Each Piece on Shopify to Cut Returns.

Why do fit notes cut returns?

Fit notes cut returns because they tell a shopper how this garment fits, which measurements in a size chart cannot do alone.

Two pieces with the same chest measurement can fit differently: one in stretch jersey, one in stiff linen. A fit note turns that difference into a plain sentence. Coresight Research estimates the average US online apparel return rate reached 23.4% in 2025 (Coresight Research, 2026).

The same report tells brands to add comparative statements, such as runs small or true to size, to the product page. Baymard Institute’s testing saw a shopper welcome a plain note that one style runs half a size small (Baymard Institute, 2022). A fit note is that sentence, written once per product.

What does a good fit note look like?

A good fit note gives a verdict, a reason and a between-sizes tip in 30 words or fewer, based on facts you know about the garment.

This illustrative before and after uses an imagined store, not a real one:

Every note has three parts. The verdict is one of runs small, true to size or runs large. The reason names the cut or the stretch. The tip says which way to go when a shopper is between two sizes.

How do I check my store in two minutes?

Open three best sellers on your phone and check whether each one says in words how it fits.

1. Open three best sellers. On your phone, open a dress, a top and an outer layer, or your three biggest categories.
2. Look beside the size selector. Find a line that says runs small, true to size or runs large, not just a link to a chart.
3. Read it like a shopper. If the line only repeats measurements, it is not a fit note yet.

How do I write fit notes with an AI agent?

An AI agent can draft fit notes for 20 products at a time, but it can only use the fit facts you give it.

An agent cannot see how a garment fits. It reads the title, description, fabric and size chart, plus whatever you add. Give it your facts, let it write the sentence, and approve every row.

What counts as a fit fact?

• Return reasons such as “too small”, if your returns app records them.
• Notes from trying the piece on.
• Fabric and stretch from the garment tag.
• Customer messages about fit, with names and emails removed.

1. Create the Fit note field. In your Shopify admin, go to Settings › Metafields and metaobjects › Products, click Add definition, name it Fit note, choose the Multi-line text type and save.
2. Show it beside the size selector. In Online Store › Themes › Edit theme, choose the Products template, add a Text block under the size selector and connect it to the Fit note field with the dynamic source icon. Your theme must support dynamic sources.
3. Test an empty field. Open a product with no note on your phone and check that no empty box shows.

1. ReadThe 20 newest products in one collection
2. ProposeA table of fit notes, nothing written
3. ApproveYou fix every row and reply apply
4. WriteOnly the approved rows
5. VerifyOpen five products on a phone

Products: [the 20 newest products in the collection Dresses]

For each product, write a fit note of 30 words or fewer. Use only facts from its title, description, fabric, size chart and measurements, plus these fit facts I know:
[Paste what you know, for example: Linen wrap dress, no stretch, runs about half a size small in the bust. Returns say too tight across the shoulders.]

Start each note with one verdict from this list only:
Runs small. / True to size. / Runs large.
Then add one line on the cut or stretch.
End with one of these only:
Between sizes, size up. / Between sizes, size down. / Between sizes, take your usual size.

Two notes in my voice:
"Runs small. The linen has no stretch, so the bust sits snug. Between sizes, size up."
"True to size. Cut close through the waist, easy through the skirt. Between sizes, take your usual size."

If you do not have enough facts to be sure how a piece fits, write "Ask me" instead of guessing.

Show me a table first: product, fit note, the facts you used.
When I reply "apply", save each approved note in the Fit note product metafield. If you cannot set that metafield, give me the approved notes as a two-column table I can paste into the bulk editor.
Do not change anything until I reply "apply".

1. Run it on 5 products first. Open Sidekick from any page in your Shopify admin, paste the prompt and read the table.
2. Fix the table, then reply apply. Replace every “Ask me” with the real fact, and delete any claim you cannot stand behind.
3. Open five products on your phone. Check each note reads naturally beside the size selector, then run the next batch of 20.

How do I write fit notes by hand, if I prefer?

By hand, a fit note takes about 3 minutes per product once you know how the piece fits.

1. Collect what you know. Try the piece on, check its tag for stretch, and note any “too small” or “too large” in your returns.
2. Write the note. Use the three parts: verdict, reason and between-sizes tip, in 30 words or fewer.
3. Add it to the product. Open the product, scroll to Product metafields, click Fit note, type the line and click Save.
4. Or fill many at once. On the Products page, select products and click Edit products, then Columns. Tick Fit note in the Metafields section, type down the column and click Save.
5. Check on your phone. Confirm the note shows beside the size selector.

How do I keep fit notes current as new products arrive?

Shopify Flow can tag every new product that needs a fit note, and a weekly run writes it.

Shopify Flow is a free app on the Basic, Grow, Advanced and Plus plans. New products have no fit facts until someone tries them on, so add those facts to the prompt each week.

1. Tag new products. Open Apps › Flow, start a new workflow, choose the trigger Product added to store and the action Add product tags, enter needs-fit-note, then turn the workflow on.
2. Or ask Sidekick to build it. Paste the prompt below into Sidekick inside Flow, review the workflow it opens, then turn it on yourself.

Create a workflow that starts when a product is added to the store and adds the product tag needs-fit-note.

Run it weekly: save the fit-note prompt above as a Sidekick skill, swap its product line for “Products: up to 20 products tagged needs-fit-note”, add the new fit facts and run it once a week. Approve the table, then ask Sidekick to remove the tag from each product it finishes.

Which apps can help?

Start with the tools built into Shopify. Add an app only when you want buyers’ fit feedback or a size recommender.

How long does it take and what does it cost?

Writing fit notes for 60 products takes about 2 hours with an AI agent, and the work is free.

These times are estimates for a first batch, not measured results.

How do I know it’s fixed?

The fix is working when every product shows a fit note and the share of returns citing size or fit starts to fall within weeks.

Run the free Styling Score again once your notes are live, and check the RET-02 card for this factor.

Then watch size and fit returns on the products you updated, using your returns app if it records reasons. Compare the 4 to 6 weeks before and after on the same products. If a piece still collects “too small” returns, change its verdict.

Where does this fit in Return?

Return has four factors, and this guide covers the second.

1. RET-01
   Size guide for this pieceA size chart written for the garment type a shopper is actually looking at.
2. RET-02
   Fit notesWritten notes on how a piece actually fits, not just its measurements.
   You are here
3. RET-03
   Fit from real peopleModel size worn and fit reviews from real buyers.
4. RET-04
   Does it suit me?Personal size and fit advice for one shopper, before checkout.

Part of Grow Your Shopify Fashion Store with Styling: Salesperson to Stylist, our guide to turning a Shopify fashion store from a salesperson into a stylist.

What else do founders ask about fit notes?

Founders most often ask these five questions.

Sources

1. Shopify Help Center. Adding metafield definitions. Checked Oct 19, 2026. https://help.shopify.com/en/manual/custom-data/metafields/metafield-definitions
2. Shopify Help Center. Metafield content types and values. Checked Oct 19, 2026. https://help.shopify.com/en/manual/custom-data/metafields/metafield-definitions/metafield-types
3. Shopify Help Center. Displaying metafields on your online store. Checked Oct 19, 2026. https://help.shopify.com/en/manual/custom-data/metafields/displaying-metafields-on-your-online-store
4. Shopify Help Center. Adding a pop-up size chart to your product pages (product page template and Product metafields steps). Checked Oct 19, 2026. https://help.shopify.com/en/manual/custom-data/metafields/pop-up-tutorial
5. Shopify Help Center. Editing metafields in bulk. Checked Oct 19, 2026. https://help.shopify.com/en/manual/custom-data/metafields/bulk-edit-metafields
6. Shopify Help Center. Shopify Flow. Checked Oct 19, 2026. https://help.shopify.com/en/manual/shopify-flow
7. Shopify Help Center. Product added to store (Flow trigger) and Add product tags (Flow action). Checked Oct 19, 2026. https://help.shopify.com/en/manual/shopify-flow/reference/triggers/product-added-to-store
8. Shopify Help Center. Sidekick. Checked Oct 19, 2026. https://help.shopify.com/en/manual/ai-powered-tools/sidekick
9. Shopify Changelog. Create Flow automations with Sidekick. Dec 11, 2025. https://changelog.shopify.com/posts/create-flow-automations-with-sidekick
10. Coresight Research (sponsored by Alvanon). Shifting the Size and Fit Paradigm. May 19, 2026. https://s3.alvanon.com/attachments/2adac6dd-81b6-4aec-a3da-272295fb9b4e_Shifting_the_Size_and_Fit_Paradigm–Coresight_Research.pdf
11. Baymard Institute. Apparel: 10 Best Practices on Sizing. Jul 6, 2022. https://baymard.com/research-articles/apparel-size-information
12. Shopify App Store. Listings for Judge.me Product Reviews · Kiwi Size Chart & Recommender. Checked Oct 19, 2026.