Please note that the pleats are not stitched expressly to protect the kilt in transit. Those zig-zag threads across the pleats, known as Basting, are actually put in when the pleats are being constructed. They are part of the kiltmaking process - at least, they are with hand-sewn kilts.

Yes, the basting is left in when the kilt is finished, but it is not added just prior to despatch.