Not only that, when I order clothes from Amazon they always come in a special plastic bag which is already prepared for re-sealing and return, instead of their signature cardboard boxes.
I guess the industry knows that the only way to sell clothes online is having more than half of them returned, no questions asked. It is probably cheaper than having physical stores to try them out, or even than standardizing clothes sizing: just let the client order the item in two or three sizes and return the ones that don't fit.