Here is what we did for a friend of mine. He got the SWK Thrifty then before we took out the pleat tacking we put it on his son measured the length and the fell I took it home and sewed the fell to the proper length and double zig-zag stitched the length and cut off the extra and it has been washed several times now and what little bit of thread at the bottom that came lose was nipped off and it looks great. because of the Velcro waistband the only reason to get him a new one will be he wore it out. Measure the kilt high and he will wear it low KIDS....
It will be a while before it is to short unless he wears it up high (never happen) in the traditional manner.

MrBill