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Size guide

Overview

Sizing questions are one of the most common reasons customers reach out before buying.

With Size Guide feature, you can teach your AI assistant exactly how your products are sized, so it can give customers accurate, personalized recommendations based on their own measurements.

You can now add size charts in multiple formats, link them to specific products, and define the measurement fields your AI should ask customers about, making every sizing conversation feel tailored and confident.

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Add a size chart

Size charts tell your AI how your products are sized. On the Size chart card, pick Text and paste your chart in whatever format your size data is already in, or pick Image and upload a picture of it.

Supported formats

Format	Example use case
Plain text	Simple S/M/L tables copied from a doc
Markdown	Formatted tables from Notion or GitHub
HTML	Size charts exported from third-party sizing apps
Image	A photo or screenshot of your chart, .jpg or .png up to 5MB

How to add a size chart

1. Go to AI agent → Instructions → Assistant skills → Size guide.
2. Click Add Size Guide.
3. Enter a name for the size guide (e.g. "Women's Tops — US Sizes").
4. Paste your size chart content in any supported format (plain text, Markdown, or HTML), or upload an image of it.
5. Click Save.

What is the instruction of AI in size guide for?

In the instruction field, tell your AI how to handle size questions. For example:

"If no size guide is found, it means you don't know the size guide information for this product. do not invent or assume any size guide details."

This instruction prevents your AI from generating incorrect sizing information. The field holds up to 500 characters.

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Link a size guide to specific products

When you have multiple product categories with different sizing, you can assign each size guide to the products it applies to. Your AI will only use the relevant size guide when a customer asks about a specific product.

How to link a size guide to a product

1. Open the size guide you want to assign.
2. Go to Product matching conditions.
3. Choose All product to use this guide everywhere, or Group of product by conditions to narrow it down.
4. For a group, set the conditions: Vendors, Tag, or Collections. A preview table below shows which products match.
5. Click Save.

When a customer asks about sizing for a matched product, the AI will automatically use that product's size guide and ignore others.

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Set up measurement fields

Measurement fields define what body dimensions the AI should ask customers for when helping them find their size. Instead of customers guessing, the AI guides them through a structured sizing conversation.

Chatty extracts these fields from your size chart when you save the guide. You can add or change them by hand at any time.

Common measurement fields include: chest, waist, hip, height, weight, inseam.

How to add measurement fields

1. Open a size guide.
2. Scroll to the Measurement Fields section.
3. Click Add field and enter the measurement name (e.g. "Chest", "Waist").
4. Add a unit if needed (e.g. cm, inches).
5. Click Save.

Once saved, the AI will ask customers for these measurements during sizing conversations and use them to recommend the right size from your chart.

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How the AI uses your size guide

When a customer asks a sizing question, the AI:

1. Identifies which product the customer is asking about.
2. Finds the size guide linked to that product.
3. Asks the customer for the measurements defined in your measurement fields.
4. Matches the customer's measurements against your size chart.
5. Recommends the best size — and explains why.

The AI automatically detects units (cm or inches) from both the size chart and the customer's message, so customers can answer in whatever unit they're comfortable with.

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Tips

• Use descriptive names for your size guides (e.g. "Men's Bottoms — EU" vs. "Men's Bottoms — US") so it's easy to manage them as your catalog grows.
• For stores with third-party sizing apps, copy the HTML output of your size chart and paste it directly — the AI can read it.
• If a size guide applies to your entire catalog, you don't need to link it to specific products — it will be used as the default.