I'm a size 6 but I only fit maybe 10% of the size 6 shoes in Clarks (for example). The other 90% are too wide in the ball of foot, or too narrow in the mid foot, etc. So they obviously have a few different lasts they use. It would be so useful if they told you on their website which shoes had been modelled on which lasts, and you could search for shoes made on a last which matches your foot shape. Maybe the 'Daisy' last would fit me really well, so I could search other shoes modelled on Daisy.
They could even have printable foot outlines of their lasts so you could stand on them and have a good guess. Surely this would reduce the number of online returns?
Is there a reason they don't do this? I saw a programme on how Dr Martens are made once, and it would definitely work for their manufacturing process anyway.