I was thinking about the zipper, too. I noticed that zipper sizes differ with each character. So make sure Zexion has a huge zipper before you buy it!
I bought my zipper 8 months ago. I have all the material to make the coat, I just haven't bothered, and my friend's been busy with college. He goes to school for fashion, so as you can imagine he knows a lot about sewing and owns a machine, he owns another kind, too. But I forget what it does! Now all I need to do is motivate him to start sewing. x.x