Earlier quoted context omitted.
It varies significantly between sectors. I for one have the unfortunate problem that my clothing size is somewhere between M and L. Whenever I buy from a new manufacturer, I basically have to flip a coin if I pick the right one. So for some clothing products, I would definitely hit 50%.
This is a well know problem with online clothes shopping by now. In the Netherlands 13% of all online purposes is returned, and between 30% and 60% (shoes) of clothing. I have the same problem with my 200cm and slim posture. I have a handful of brands I can order blindly, but jeans in particular are a chore to get the right fit. I strongly prefer brick and mortar shops, but size availability varies. People used to th…
And the EU actually mandates a free 2-week return window based on the fact that you can't see the product before you buy.