Question

why polysters are preferred over natural fibres for making dress material

Answer 1

there are many reasons regarding this

polyester is a artificial fibre so easy to make!
whereas to get natural one you need to rear sheep's or grow it!

polyester dry's easily
natural ones take a really long time especially monsoon

polyester is shiny and can attract the attention of the people
the most shiny one is silk which has disadvantages like
expensive
takes long time to dry
not as attractive as polyester

Another one polyester is cheap to make
Natural ones are way expensive than that