Is character customiztion available for humanoid character?

I'd like to replace something like armor ect. for my character just like the official character customization sample code. But when I replace the old parts mesh with new parts mesh of my character, I found it didn't work with animator. He is totally motionless. I seemded like the new mesh dosnt match the avatar. now I'm confused if the humanoid animations can also make this. Thank a lot for your reply