^Faliero Sarti has the softest scarves I've handled, but you need to see it in person and there's a lot of different materials. Stephan Schieder, LUC, Daniel Andresen. There's also a lot of under the radar designers that only(?) make scarves, by which I mean just go into random shops in Tokyo and touch them all.
Also, Hotoveli sale 30% off started. A1923 has officially entered the retail pricing scheme.