whatsizetobuy answers “does it run big or small?” at the model and cut/line level — not just brand averages or generic US↔EU charts.
Generic converters are everywhere. What shoppers still struggle to find is whether this last or cut runs long, short, narrow, or true to size. That is our focus.
We are early: most fit rows are labeled low confidence / draft until verified against multiple independent sources. We do not pretend otherwise — see methodology.
Tools: size converter, brand comparisons, clothes guides.