Invisibility is Not Working!

(This was done in the test environment Minecraft and MCreator 1.7.5) I am trying to make a piece of armor that gives invisibility. The texture for the armor is clear. I used events to add invisibility to the player (time: 0 amplifier: 0), and the icon shows up in the inventory; however, the player still shows up. I tried drinking a potion of invisibility and that worked, so Minecraft is fine. Am I doing something wrong, or does this just not work? Please help me!