As I recall, the Scout shirts in the 70s had no collar so there was not too much fabric in the neck area, Since the Neckerchief was was worn over the collar. "Never liked it much."
Close inspection of the above photo shows a collar hidden under the neckerchief.
There was an old Scottish scout-master in our area who was kilted on formal ocasions. Can't remember the tartan.
Proper wearing of the neckerchief was Over the collar
when wearing short pants in summer, we also wore high sox with garters and Flashes. I'm going to see if my dad has any of my old scout stuff I will certainly wear my old the flashes with my kilt. As i recall they were high quality, woven, tapered, and wrapped. Not just cut ribbon like I see alot of today with kilts.