A pair of pants can be made any kind of
textile fibers. Majorly cotton and polyester are used in fabrics that is used for
making pants. Depending on the design and end use, and comfort to wear apparel brands
and garment manufacturers decide what type of fiber to use for a specific pants
design.
If you just like to know what type of fiber
is present in your trouser, you need to do the fiber content testing. There is
some testing method that can be used to know actual fiber content. Even there
is blend of fiber, that can be identified.
In two piece suits, wool fiber is also present
in the trousers.