is it possible to give the items the skins they have if removed ?

If the entity has skin, the returned item should have same skin

Works fine on my server.

I see that you can loose the skin if you have a plugin that "stacks" over the limit..... & the slot overflows...
But that is due to the way the stacker" plugin works, not the "remove" plugin.

Also  you cannot use it to "duplicate" skins you don't own, which is correct....