Adding buff to player via skin attachment

Hello, I am working on an Ark mod and I’m having a bit of trouble with one particular item.
I am trying to make a backpack skin that can be applied to a worn chest item, but I want the backpack mesh to show as well as the default mesh of the item being skinned.
Right now when I apply the skin neither mesh shows, I would be willing to settle with the backpack not showing for now, if I could just get it to stop hiding the normal item mesh.

I am also trying to have it add a buff to the character when worn that will increase their carryweight, I applied an existing food buff item to the “Buff to give owner character” but it does not seem to apply it.

Any hints, guides, advice would be welcome!