from the GNU version of the Collaborative International Dictionary of English
- adj. completely incased in armor, sometimes described as armed cap-à-pie.
Sorry, no etymologies found.
Now it happened that Lord Walter of Autreche had himself armed at all points within his pavilion; and when he was mounted on his horse, with his shield about his neck and his helmet on his head, he bade lift up the tent-flaps, and pricked out against the Turks; and as he started off alone from his pavilion his servants all set up a cry of "Châtillon!