This 1921 article reads: "domination of the world by Anglo-Saxons wearing the tarn helmar":
These guys knew what they were doing...
From wikipedia.org/Cloak_of_invisibility#Tarnkappe:
Although occurrences in fairy tales are rare, the cloak of invisibility appears in the German tale The Twelve Dancing Princesses and in The King of the Golden Mountain in Grimm's Fairy Tales. The cloak in German fairy tales may be traceable to the tarnkappe ("cloak of concealment"), such as the one that the hero Sîfrit (Siegfried) acquires from the dwarf Alberich in the Middle High German epic Nibelungenlied. [...]