Yes, people are trying. The problem is hard.
When I get home later I will try to remember to give this a shot. The concept is awesome and it really is a "value add" worth some markup if you can shop online with some realistic expectation of fit.
And I understand the issue with less expensive stuff. The tolerances on cheap clothing (and plenty of not so cheap clothing) must make it hard. I've bought multiple pairs of the same "number" Levis and they fit completely differently due to how they cut the fabric I guess.