Fibre
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About
Cotton, Milkweed Jute, Rags, or Bark Fibres can be used as Fibre.
Milkweed Jute can be obtained by putting Milkweed Roots in a Fireplace or Meatsmoker to make Charred Milkweed Fibre. Using a bucket of water on the charred fibre will create the Milkweed Jute. Alternatively if you can't afford a bucket, you can take the charred fibre out of your inventory and right click it on a water source tile to clean it.