Okay... I'll take a shot at this.

McNice, do you have ANY tailors in your area? If yes, then ask them about making a hem to your desired length. DO NOT try to do this yourself.

The tailor (or seamstress) will be able to determine whether the hem needs to be trimmed, sewn and pressed... or just hemmed and pressed.

Take the kilt in to the place, and let them give you an honest assessment and price.