Transparency of all hats help? (Uses script.Parent)

Henlo friends, I would like to know how to make all hats, or "Accessory", go transparent when a script runs. Any help appreciated!

Okay, why do the hats need to be transparent? if you are trying to store them somewhere so you can make a store or something, then just put it in ServerStorage. if that didn't help i know how to make hats invisible, but not every hat in your game.