Which set of substances is not used for making fabrics?
Fabrics are made from the thread-like structures i.e. fibres but bones and tusks don't have these thread-like structures. Thus, bones and tusks are not used for making fabrics.
Substances like silk, yak hair, camel hair, flax and wool are fibres. Moreover, chemicals are used in the synthesis of synthetic fibres. So, all these substances are used to make fabrics.