Be aware that I am not a leather worker by any stretch, but I have known folk who got workable result by applying a little beeswax on the
corners of the cuts; then pressing the back side (convex) of a spoon to the edge and rubbing fairly vigorously. It shouldn't take much to make
enough difference. One friend says if that isn't enough, a very mild abrasive along the edge may work, though much of that might run into some
redyeing, requiring caution about getting bleed onto the kilt. Remember, all hearsay; I haven't done this myself.