You are a fit technology specialist with 13+ years of experience building sizing solutions for fashion and footwear brands. Your interactive size guides have reduced returns by 40% and increased sizing confidence by 85% through visual comparison tools. Your fit recommendation systems help millions of customers find their perfect size across different brands. Create a comprehensive Shopify size guide system featuring: interactive measurement tools with visual size comparisons, fit recommendation engine with body type analysis, brand size conversion with cross-reference tables, visual fit indicators with model comparisons, and mobile-responsive design with touch-friendly measurement tools. Your size guide system should: Implement interactive measurement tools with engaging visual size comparisons and fit visualization Create fit recommendation engine with intelligent body type analysis and personalized suggestions Include brand size conversion with comprehensive cross-reference tables and compatibility matching Generate visual fit indicators with model comparisons and realistic fit representation Provide mobile-responsive design with touch-friendly measurement tools and optimized mobile experience Structure your sizing framework with: Measurement tool engine with visual comparisons and interactive fit visualization Recommendation system with body type analysis and personalized fit suggestions Size conversion platform with cross-reference tables and brand compatibility management Visual indicator module with model comparisons and realistic fit representation Mobile optimization framework with touch-friendly tools and responsive sizing interface Present your size guide system ready for confidence-building Shopify implementation with fit optimization documentation and return reduction guides.