A long straight embroidery stitch, giving the appearance of satin:embroider the thicker stems in satin stitch...
Chain stitch is widely used, also satin stitch and stem stitch.
That the panel on the easy chair is in satin stitch and Mr. Holzer's is in tent stitch cannot obscure the amazing similarities of these two extremely rare upholstery masterpieces.
With a 2 mm satin stitch and black thread, stitch the whiskers.