My hero doesn't equip the new weapons and armor I got. What gives?

Each character can only wear equipment made of certain materials (Cloth, Leather, Plate Metal). Characters who wear the same material type can interchange armor and accessory pieces. The game automatically omits the equipment the hero can’t wear when you’re manually selecting them. For convenience, you can tap the Auto button to have the game automatically select the best gear available from your inventory for the hero.