How to Use Shopify Metafields for Fit Notes

To use Shopify metafields for fit notes, create a product metafield definition for each note you want, fill it in per product, and show it on the product page through your theme editor. A metafield is a custom field that stores extra information about a product, such as "runs small".

Fit notes are one piece of helping shoppers choose a size. Pair them with a try-on and sizing tool, as described in our guide to adding virtual try-on to Shopify.

What is a metafield?

Shopify describes a metafield as a way to extend its built-in data with custom information. Each one has a namespace and key, a value and a type, as explained in Shopify's developer documentation on metafields.

For a clothing store, think of it as a labeled box on each product. You decide what each box is called and what goes in it.

Which fit notes are worth storing?

Pick a small set, and use them on every product so shoppers know what to expect.

• Fit type: fitted, regular or relaxed.
• Sizing advice: runs small, true to size or runs large.
• Model info: the model's height and the size worn.
• Fabric stretch: none, some or high.
• Length note: where the hem sits on the model.

Keep the wording fixed. A choice from a list is better than free text, because it stays consistent across your catalog.

How do you create the metafield definitions?

Shopify's metafields help page describes the workflow: add a metafield definition, add values to products, then connect the field to your theme. Menu names change, so follow that page for the current steps.

1. Create a product metafield definition for each note, such as "Fit type".
2. Choose a type. A single-line text or a list of choices works well for short notes.
3. Add validation if you want to limit values to your approved list.
4. Save the definition.

Definitions also enforce rules for what can be entered, which Shopify says helps keep values consistent. If your staff will fill them in, check that their permissions allow editing products.

What does a good set of fit notes look like?

Here is an example of how three products might use the same fields. These are made-up examples.

Field	Slim shirt	Wide trousers	Wrap dress
Fit type	Fitted	Relaxed	Regular
Sizing advice	Runs small	True to size	True to size
Fabric stretch	Some	None	None
Model info	180 cm, wears M	170 cm, wears S	175 cm, wears M

Because every product uses the same fields, shoppers learn where to look. It also makes your catalog easier to audit later.

How do you fill in the values?

Open each product and enter the value for each fit note. For a large catalog, check Shopify's help pages for bulk editing and import options.

A simple routine keeps data clean:

• Write fit notes when you photograph a product, not months later.
• Have one person own the wording.
• Review any product that gets fit-related returns and update its note.

How do you show fit notes on the product page?

Shopify says that if your theme supports dynamic sources, you can connect most metafields in the theme editor. Otherwise, you may need to edit the theme code, which your developer can do.

1. Open the theme editor and go to the product template.
2. Add a text or rich-text block under the size selector.
3. Connect its content to your metafield with the dynamic source option.
4. Preview a product with a value and one without. A missing value should show nothing.

Place the note near the size choice, so the shopper sees it at the moment they decide.

What can fit notes not do?

Fit notes are general advice about a garment. They do not know the shopper's body.

A line like "runs small" helps only if the shopper knows their size in your brand. To bridge this, add a tool that matches the shopper's measurements to your size chart. Our guide to adding a fit quiz to a Shopify store is one route. A body scan is another.

ZeDaq.ai recommends a size from one photo and the shopper's height, matching measurements to your own chart. You can install it from the Shopify App Store.

How else can you use metafields in a fashion store?

Once the setup is in place, the same pattern works for other product details. Examples include care instructions and fabric origin. If you also want to reward repeat buyers, see our review of Shopify loyalty apps for clothing brands.

To compare tools that give the shopper a size, read about the best AI virtual try-on apps for Shopify.

FAQs

Do I need an app to use metafields?

No. Metafields are part of Shopify, and you can create and edit them in your admin. An app is only needed for extra features.

Can I show a metafield on my theme without code?

Often yes. If your theme supports dynamic sources, you can connect most metafields in the theme editor.

What type should I choose for fit notes?

A single-line text or a list of choices is usually enough for short notes. Use a list when you want the same wording everywhere.

Will metafields change my SEO?

Text you show on the page can be read by search engines, like other page text. Keep notes accurate and useful for the shopper.