Dough Armor

You touch a willing creature who isn't wearing armor, and a thin, magical layer of crust forms over their body. The target's AC becomes 13 + its Dexterity modifier. The spell ends if the target dons armor or if you cast this spell again. Additionally, when you cast this spell, you can choose to make the crust resistant to one of the following damage types: bludgeoning, cold, or fire. The target gains resistance to the chosen damage type for the duration.