Step 12: Per World Inventory
Per World Inventory is a plugin that works in conjunction with Multiverse to group worlds together to keep inventories and player settings shared, and to also not allow sharing between groups so that Creative world items can't be brought back into a Survival world. It is very easy to setup as the default settings are pretty much all you will need in teh config.yml file, and so all we need to do is setup the worlds.yml file for any world we add.
worlds.yml
So all I did for my class, was to group all the survival worlds together so they could adventure and bring back the loot they found, but none of the creative worlds were allowed to share the same inventories and prevented them from cheating by moving between worlds.