chainmail armor getting thorns-like potion effects

Right now, chainmail armor is pretty useless. It's hard to get and is still weaker than iron armor, which can be easy to get. I have an idea to fix this. It would work like tipped arrows in a way. If the chainmail armor has a potion effect, mobs that hit you while you're wearing the splashed chainmail armor will have a 1/4% chance of getting the effect. My idea of how the chainmail armor would get a potion effect will be when you are splashed with a potion while wearing the chainmail armor. The chainmail should only be able to have one effect without commands. For example, if you're wearing chainmail leggings and you get splashed with a splash potion of poison, then whenever someone or something attacks you while you're wearing those mystic chainmail leggings, they will have a 1/4% (25%) chance of getting the poison effect. If you're wearing a full set of chainmail armor that all have the same effect, it will be a 100% chance that you will give others that effect when they hit you.