it is believed that the first type of fabric is felt fabric that was created without the proper concern of the people, the first human in the world.
the primary and the most basic use of a clothing is to protect body from surrounding environment, not to cover shame. i have seen that most of our relevant people believe that to cover shame, we clothe ourselves.
ancient people used to collect wool fibers from their domestic animals, and wrapped their bodies with wool with the help of thread of plants. So, the people fond that the wrapped wool under their footplates, is not wool anymore, those fibers have created clustered, i mean felt fabric
the reasons behind the wool converting into felt fabric was heat, moisture, pressure from whole body, and basic properties of wool fibers.