Im using this store plugin
[ANY] Store by Zephyrus [1.1 - 03.01.2016] with player skin chooser. It works, I can choose a player skin that I want and I don't have any problem with that but when I tried adding a custom skin model from playerclasses.txt it doesn't override the skin from Store.
For example. I bought and changed my skin to batman using !store, then I change my class/skin from !zclass, Then I change again to batman skin. My skin wont change to batman skin and still a custom skin from !zclass.