Sewing machines do not have eyes to guide the needle.

Hand sewing craftsmen sew much slower and more accurately.

Hand sewing craftsmen do not use a bobbin thread.

Hand sewing craftsmen - at least members of the Kiltmaker's Guild - use special strength thread from Germany or Britain rather than thread made to feed through a sewing machine needle.

Hand sewing craftsmen can position the kilt at many angles other than flat - as needed.

Hand sewing craftsmen seem to have apprenticed, or gone to Keith Kilt School. Machine sewn kilts seem to be sewn up more like a tailor would sew a garment.

Hand sewing craftsmen can hide a stitch better than a machine can.

Probably missing a bunch more differences...but a start.

Ron