John, on the Stillwater site they recommend hemming the Standard. Another way is run a fine zig-zag stitch and cut it off. Jimmy gave me another way using HeatnBond tape, but I'll have to try that myself before I rocommend it. Since the Stillwater isn't heavy material I suggest following their recommendation. Here's the relevant paragraph...

Our Standard & Economy kilts are made in a 24" length, and custom lengths are not currently available. These kilts are easily hemmed to any desired length, and hemming is essentially undetectable if done correctly with a machine-sewn blind hem stitch. Only on the heaviest weights of kilt fabric does a hem become visible because of the thickness, and on lighter-weight kilts a hem can add weight to the bottom edge, making the fabric hang even better, behaving like a heavier-weight fabric.
We do not offer hemming service at this time, this is best done by any local tailor/seamstress.