Dying armor is extremely simple, but you're only allowed to dye leather armor pieces in Minecraft. Other armor, such as iron, gold, diamond, et al, can't be dyed.

Leather armor in Minecraft can be dyed using different methods in Java and Bedrock Editions. Players need dyes, a crafting ...

— Minecraft (@Minecraft) January 24, 2023 With that said, if you look to make a template and want to dye it, then you’ll have to use different gems and ingots. This could be anything from ...

Minecraft has just announced that in update 1.20, you’ll be able to customize your armor. This is a great addition for anyone who felt like their gear in-game could use a bit more color and variety.