indument

/ɪnˈdjuːmənt/
noun
  1. A covering, especially of hair, fur, or feathers on an animal or plant.
    • Botanists examined the indument on the leaf to identify the plant species.
    • The indument of the caterpillar was soft and fuzzy to the touch.
    • The bird's indument of feathers kept it warm during the cold winter.