So this is left to each party's discretion. With both of my gaming groups, we chose to take the harsher view that the mage needs the requisites to teleport non Co materials along (except for the talisman, for the same reason as the carried familiar).
This encourages necromancers to actually dress like the part, with human leather robes and belts, bone buckles etc. The ReCo mage in the saga that I ran had the creepy leathercrafting grog bring back the bodies of three dead bandits that the party had killed and fashion the outfit for him.
It is an (aesthetic) choice.