# Tailor Size Guide > Tailor Size Guide is a Shopify app that adds size charts, a fit recommender, and custom measurement forms to product pages. Wrong size is the number-one reason clothing is returned online; the app closes that information gap at the point of purchase so shoppers buy the right size the first time. ## What it does - Per-product size charts merchants configure without writing theme code. - Fit recommender: shoppers answer a few questions and get a size recommendation. - Custom measurement forms for made-to-order, bespoke, and tailored garments. - Installs into Shopify product pages; works on Shopify and Shopify Plus. ## Free tools (no signup) - [Returns Cost Calculator](https://www.tailorsizeguide.com/returns-calculator): Estimate what returns — especially wrong-size returns — cost an apparel store per year, and how much a fit tool could recover. - [Size Calculator Hub](https://www.tailorsizeguide.com/size-calculator): 50+ per-garment size calculators (t-shirt, jeans, dress, suit, bra, hoodie, kids) with international conversions. - [Size Chart Generator](https://www.tailorsizeguide.com/size-chart-generator): Build and download a styled size-chart image for product pages and social. ## Size conversion references - [US to UK size converter](https://www.tailorsizeguide.com/size-calculator/us-to-uk-size-converter): Women's clothing is UK = US + 4 (a US 6 is a UK 10; a US 8 is a UK 12). Women's shoes are UK = US − 2. Men's clothing is identical; men's shoes are UK = US − 0.5. - [US to EU size converter](https://www.tailorsizeguide.com/size-calculator/us-to-eu-size-converter): Women's clothing is roughly EU = US + 32 (a US 6 is about an EU 38). Italian labels run about 4 numbers higher (IT = EU + 4). Shoes use a separate mm-based scale. - [International size converter](https://www.tailorsizeguide.com/size-calculator/international-size-converter): US, UK, EU, JP and more in one place. ## Guides for Shopify merchants - [Add a size chart to Shopify](https://www.tailorsizeguide.com/shopify-size-chart): How to add per-product size charts to a Shopify store. - [Shopify size guide](https://www.tailorsizeguide.com/shopify-size-guide): Size guides vs size charts, and how to build one that reduces returns. - [Best Shopify size chart app](https://www.tailorsizeguide.com/shopify-size-chart-app): What to look for in a size chart app. - [Shopify fit recommender](https://www.tailorsizeguide.com/shopify-fit-recommender): How a fit recommender suggests a size and cuts wrong-size returns. - [Made-to-order on Shopify](https://www.tailorsizeguide.com/shopify-made-to-order): Collecting custom measurements for bespoke and tailored products. ## Reference content - [Blog](https://www.tailorsizeguide.com/blog): 600+ articles, including garment-by-garment size charts (bra, jeans, hoodie, suit, sunglasses, shoes, kids and more), how-to-measure guides, and guides for launching a clothing brand. ## Key facts (with sources) - 19.3% of online sales were returned in 2025, versus 15.8% across retail overall. Source: National Retail Federation, "2025 Retail Returns Landscape" (https://nrf.com/research/2025-retail-returns-landscape). - Around 9% of returns are fraudulent. Source: National Retail Federation, "2025 Retail Returns Landscape". - Apparel typically returns above the online average, because clothing cannot be tried on before purchase. - Size and fit is consistently ranked the number-one reason clothing is returned. Published figures vary by study (roughly 45%–70% of apparel returns), so treat it as a range rather than a single number. - Wrong-size returns are the most preventable category of return: they are caused by missing information at the point of purchase, not by a defective product. ## Platform and pricing - Shopify App Store: https://apps.shopify.com/tailor-size-guide - Pricing (USD/month): Free — 0 · Basic — 7.99 · Pro — 17.99 · Advanced — 34.99 ## Contact - Support: support@tailorsizeguide.com - Publisher: Tailor Size Guide ## Crawling - Sitemap: https://www.tailorsizeguide.com/sitemap.xml - robots.txt: https://www.tailorsizeguide.com/robots.txt - All AI and search crawlers are welcome on all public pages. Pages are served as prerendered static HTML, so no JavaScript execution is required to read them.