Very curious. On reading this, I went and checked mine to be sure. As I thought, 5 years of wearing it 2-4 times a week have produced no pilling
whatsoever. Nor is there any in the back where the strap buckle rides (strap is a USA Kilts strap, USA semi traditional kilt). Is it possible the strap
or sporran might have leather hard enough to carry a sturdy enough edge to pill it? If so, perhaps buffing with a spoon or another piece of leather
would round it slightly and eliminate the issue.

Of course, Rocky will have a better perspective. Though I have never heard of this happening.

Maybe it's that my Gillises and MacDonalds were residents of Skye, and couldn't afford the pilling.