Re: Article: Customizing the Dogi by "The Mirror"
I add elastic to my drawstring pants. Just thread it through alongside the drawstring and (machine) sew the ends together with about a 1" (25mm) overlap. Personally, I've found the easiest way to thread it through is to tape it to a chopstick.
I like Marc's idea of replacing the cotton drawstring with a synthetic one, I'll definitely give that a try.
I usually find new pants a bit too long, and the waist a little high (or the crotch too low, depending on how you look at it), so I usually lower the waist a bit rather than turning them up at the ankle. Its pretty simple to do with a machine, though I imagine it'd be rather tedious by hand.