Dearest Overseer,
While it may seem that products appear from nowhere out of thin ether, I can assure you that in order to make clothing, we require raw materials. The personnel that collect those raw materials are spinners and weavers, which I am sure (or at least hopeful in the prospect of such knowledge) you know falls under the umbrella of the clothing industry.
While I am amused by the idea, we cannot fashion clothing from beard hair. Clothing does not magically appear from thin air simply because you file a requisition with the management office.
Due to the nature of dwarven bureaucracy, there is not a direct means of filing a petition to have armed detachments accompany our workers into the caverns to collect webs, despite the dangers involved in that job. (and, I am fairly certain that if there was, you would simply complain that we filed such requisitions.)
If you would prefer to have us use only animal hair, or plant based fibers for clothing, please set up appropriate workshop designations with appropriate source stockpiles, and enable appropriate labors and job operations on either pen/pastures or farming operations, so that we have raw materials to utilize. By default, we will use whatever is available, and will seek out all available raw materials to maximize product availability.
While I am sure you will remind me about how difficult and onerous it is to manage a fortress economy, I would remind you that it takes only a few moments to link the raw materials stockpiles with our workshops, to give us instructions of this kind.
Busy as always--
Clothier #563