When not wearing a woggle, international scout's will tie their kneckerchiefs (aka neckers) with a Friendship knot.
It is not uncommon for them to wear them over their should like a Den Chief knot as well.

 

A woggle is a woven neckerchief slide commonly used by international scouts.
Learn how to make your own on this YouTube video:  https://www.youtube.com/watch?v=tvW2eX0AW94