I've been reading Otto Jiricek's Northern Hero Legends and found something interesting.
Tolkien took the idea of the Eldar's cloaks making the wearer invisible (or nearly so) from Germanic legends. But in the original German legends, it's only Dwarves who wear them.
Of course, for the Norse and Germans, there was not much distinction between a dwarf and an elf, but anyway, originally those magical invisibility cloaks belonged to dwarves.
Ratpack – Shattered Star Book 2, Session 33
11 minutes ago