Garde-collet

These passe-gardes, or garde-collets, which sometimes are greatly elevated, distinguish the armour of the reigns of Charles VIII., Louis XII., and Francis I., of France (severally, A.D. 1483 to 1496; 1496 to 1515 […]).

Source: wiktionary

They act as a support by means of which the armour is hung from the shoulders. In some old suits of armour two stiff crescent-shaped pieces are fixed to the top of the Wata-gami, forming a sort of "garde collet." They are omitted in the later armour, together with other appurtenances, such as […]

Source: wiktionary

[…] his neck is protected by a standard of mail, and the cusped pauldrons are surmounted by garde-collets; the coudes and genouillieres are also cusped and have butterfly roundel extensions; on his feet are broad sabbatons with spurs.

Source: wiktionary