PIGLIN GOLDEN ARMOR

/summon minecraft:piglin_brute ~ ~1 ~ {ArmorItems:[{Count:1,id:golden_boots},{Count:2,id:golden_leggings},{Count:3,id:golden_chestplate},{Count:4,id:golden_helmet}]}

SKELETON CHAINMAIL

/summon minecraft:skeleton ~ ~1 ~ {ArmorItems:[{Count:1,id:chainmail_boots},{Count:2,id:chainmail_leggings},{Count:3,id:chainmail_chestplate},{Count:4,id:chainmail_helmet}]}