Question

why is came wool not used for making sweaters

Answer 1

Because it's in very hot temperature and easily catch fire which is not good for us.

Answer 2

Camel hair has two components: guard hairand undercoat. Guard hair is the outer protective fur, which is coarse and inflexible and can be woven into haircloth. (Guard hair may be made softer and plusher by blending it with another fibre, especially wool.) The undercoat, which is shorter and finer than guard hair, is less protective but more insulating. It is very soft and frequently used in the making of textiles for coats.