Where is a fiber?
Fibers The fibers are obtained by mowing hemp. The hemp plant is tall and hard to miss. Given that it loves to grow in open fields or meadows. The pink-red flowers above are especially good reference points when searching. To harvest fibers first you'll need a sickle, which you'll literally make at level 1 in the starting camp.
Fiber becomes fabric
These fibers are used to create various types of fabric and cloth. In any settlement there is a loom, with which you can create fabric, e.g. (Linen). One unit of (linen) requires 4 units of fiber. Good armor or clothing can be sew from this fabric. But keep in mind that the higher the level of the item you want to sew, the more fabric and fibers will be required. For example, to create Sateen we already need 4 units of Linen and accordingly 16 units of Fibers, so never pass by the bush that says Hemp. Also fibers required to complete some tasks from the city board, and if you have enough of it, then this is a quick way to earn some experience points.