Kiton Hand Stitching?

Looks like machine. In my opinion, for a seam like that, handstitching doesn’t make a difference with respect to wearability.

I just checked one of my Kiton jackets that’s quarter lined and I see that the stitching is the same as the stitching that you had shown in the picture.

No worries about that particular stitching, and just enjoy the garment and wear it to your good health :)