DerFit

DerFit — Size Intelligence for Shopify Fashion Brands Fashion brands lose 20–30% of their revenue to returns every month. The number one reason? Wrong sizes. Customers don't trust size charts. A medium at one brand is a large at another. A size 38 in Europe is an 8 in the US. So they do what makes sense — they order two sizes, keep one, and send the other back. On your bill. Every time. DerFit fixes that. What is DerFit? DerFit is a B2B Size Intelligence tool for Shopify fashion brands. It gives customers the right size recommendation directly at checkout — based on real body measurements, not guesswork. The result: fewer returns, higher margins, and a better customer experience. DerFit is live on the Shopify App Store and available for fashion brands of all sizes — from independent labels to scaling e-commerce brands. How it works For the customer: They click "Find my size" on a product page, prop up their phone, and take 4 short photos. DerFit's AI body scanner analyzes their body measurements in seconds and instantly recommends the perfect size — before they order. For the brand: After installing DerFit as a Shopify plugin, the brand enters the exact measurements for each garment — chest, waist, hips, and more — for every size in their catalog. DerFit then matches each customer's unique body profile against these specs and delivers a personalized size recommendation at checkout. No guessing. No size charts. Just the right size, every time. Key Features → AI Body Scanner — camera-based, 4-photo process, works directly in the browser. No app download required. → Smart Size Recommendations — matches real body measurements against brand-specific garment specs for precise, personalized recommendations. → Brand-Specific Admin Rules — define custom fit preferences per garment type (slim fit, regular, oversized) to match your brand's sizing standards. → Post-Purchase Feedback Loop — customers rate the fit after receiving their order. This data feeds back into the system to continuously improve recommendation accuracy. → Analytics Dashboard — track return rates per product, monitor scan activity, review customer fit feedback, and identify which sizes are recommended most frequently. Full visibility into the fit data behind every return. → Store Owner + Internal Views — separate dashboard views for brand-side analytics and DerFit internal monitoring. → Shopify Native — built as a Shopify app with Theme App Extensions (App Blocks) for easy setup. No coding required. Who is DerFit for? DerFit is built for Shopify fashion brands that sell clothing online and are tired of high return rates eating into their margins. Whether you're running a streetwear label, a premium fashion brand, or a fast-growing Shopify store — if sizing is a problem, DerFit is the solution. Why DerFit? DerFit was built by Korra, former founder of LeVoleur — a fashion brand that generated €600k in revenue and faced the same return problem every clothing brand faces. DerFit was built from the inside, by someone who lived the problem. That's why it works. The fashion industry has a sizing problem. DerFit is the solution.