Why clothing sizes vary and how to shop smarter online

According to a Vogue Business survey, 91% of shoppers say their clothing size changes depending on the brand. Clothing sizes differ because the fashion industry has no universal sizing standard, brands design to their own measurements, fit models, and commercial goals. Add vanity sizing, regional conventions, and fabric differences, and a single size label becomes a poor predictor of fit. At Wear Style Corner, we built this editor-curated guide to explain the causes and give a numbered playbook for shopping smarter online.