It could also be a returned kilt ripped apart, resewn, and offered up for sale. Returned or defective kilt that didn't meet the cut the first time.

I have seen this done with denim jackets and denim jeans. Where the stitching used to be there would be a long line of little holes that would come apart over time... I learned how to spot this as a savy flea market shopper. People would take piles of factory rejects, resew them, add a phony designer label, and sell them at a much greater cost as being the real deal. The little lines of holes were always easy to spot.