Possible to lock items in slots?

I wanne make use of this as RPG kits :) Like the bunny costume, or santa claus.

Can I some how make the slots locked at specific kits? That people can not use them to gain gear and abuse it rpg idea :) 

And that it pastes with the empty spots??

Greetz!

so you mean that you can over-write a players inventory and belt?
Yes ^^ or that the kits who are spawned in are locked?