alt Hacker NewsI'm curious of source on this being more than anecdotal?
The most natural way for shoe mismatches is from the showroom. Customer grabs 5 pairs, tries some on, they get mixed up when returning to stock. Same shoe and size (hopefully, lol), but different production number and different factory/origin.
How often do you really expect a customer is grabbing multiple pairs of the same size/model/color of shoe to try on? Maybe it's just where I shop but it's rare that there's even more than one example of the size I need in the style/color I want to allow such a scenario to occur.