I don't think it's standard, at least not globally speaking. It may be done by others though. Which makers have done it that way for you, Sprout? Pics?
Some other ways of doing it:
Chan, with straight machine stitch:
Luxire, with the fabric edge folded under and then hand stitched:
P. Johnson with looping machine stitch:
@UrbanComposition, if you'd rather we spun this off into another thread, let me know. I'd be interested in seeing your...