fly with itens and armors

I need help with this, I've been trying to do this for a LONG time and I can't, which is to make it so that when the player holds an item from the mod, he can fly, and when he's not holding it he can't fly anymore, and without interfering with the flight of the creative mode. And the other thing I wanted to do, and like this, but on a chest piece, that when the player is wearing the chest piece he can fly, and if he's not wearing it, he can't fly anymore, and again, without interfering with the flight of the creative mode. Someone help me please ;-;