how do i make custom armour?

[spring gust]

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[vale forge]

unfortunately not possible

!faq java-armor

[spring gust]

FAQ

Java: Armor

The armor model when worn on players/entities cannot be remodeled in vanilla Java edition, only retextured. Pumpkins and other items set on a player's head can be remodeled for custom hats, but won't display if set on feet/legs/torso.
(Any item can be put on the players head via the /item replace command (aka /replaceitem before 1.18), or ofc via mod or plugin methods).
Furthermore, with this pack you can give a large set of specific leather armor colors a unique texture without interfering with the colors available in a normal survival situation: https://github.com/Ancientkingg/fancyPants

With Optifine it is possible to add texture variants on any armor pieces depending on the name, damage and other nbt, but remodelling is also not possible with it.