The later.
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Boiled clay plates, and even stones were used as vests and pectorals, plus tied bones forming vests and pectorals. Yes, some of your assumptions are correct. The basic and common armor was leather. But others described probably existed.
Source: https://siberiantimes.com/science/casestudy/features/warriors-3900-year-old-suit-of-bone-armour-unearthed-in-omsk/
------- Warrior Kiribati ----
Source:https://www.khanacademy.org/humanities/art-oceania/micronesia/a/kiribati-armor
More Warriiors
Warrior - Kiribati
Source: Three objects that have journeyed from Oceania to the Horniman World Gallery – Museum Crush
Source; Piterest
Weapons
Source: Reserch Internet.
“Coconut warrior”
Roro-buraka warrior poses with sharks-tooth lance, Kiribati 1892.
Source: https://twitter.com/macleaymuseum/status/487019956626673664
American Warrior - Natives.
Infinity of Nations: Art and History in the Collections of the National Museum of the American Indian - George Gustav Heye Center, New York 1900 armor vest.
Source: https://www.pinterest.co.uk/pin/118641771404328684/
Source: https://www.pinterest.co.uk/pin/392305817512372705/
Some battles were like that in the Neolithic …
http://culture-of-peace.info/books/history/prehistory-war-2.html