Almost all of the products that I have returned after purchasing online has been fashion products and is either due to incorrect measurement or wrong material. This means a product say a Shirt/T-Shirt having mentioned with a chest size of 42' (some brands call it L, some M, some XL ) actually arrives with a chest size of 44'. Then lot of products mentioned being made of 100% cotton turn out to be not 100% cotton.
All that the ecommerce companies have to do is mention the garment/shoe size accurately and also give suggestion about the fitting for a particular body size. So for some garments like jackets, it needs to be mentioned that the ideal fit would be that wherein the garment size is 1-2 inch greater than the body size.
The question is are the e-commerce companies being strict enough on the vendors regarding this aspect because it's been this way for so many years. With touch-less buying accurate specification is the minimum expected.