Chainmail armor cannot be crafted in Minecraft survival mode
Obtain chainmail armor from villager trades
Obtain chainmail armor from loot chests
Obtain chainmail armor from mob drops
Obtain chainmail armor from fishing loot in some versions
Use commands in creative mode to get chainmail armor
Give command example: `/give @p minecraft:chainmail_helmet`
Give command example: `/give @p minecraft:chainmail_chestplate`
Give command example: `/give @p minecraft:chainmail_leggings`
Give command example: `/give @p minecraft:chainmail_boots`