panoply: [17] Panoply originally meant a ‘full suit of armour’; the modern sense ‘impressive array’ is a metaphorical extension that did not emerge until the 19th century. The word comes via French from Greek panoplíā, a compound formed from the prefix pan- ‘all’ and hópla ‘arms, weapons’. [panoply etymology, panoply origin, 英语词源]
1570s, from Greek panoplia "complete suit of armor," from pan- "all" (see pan-) + hopla (plural), "arms" of a hoplites ("heavily armed soldier"); see hoplite. Originally in English figurative, of "spiritual armor," etc. (a reference to Eph. vi); non-armorial sense of "any splendid array" first recorded 1829.