ICI Fibres developed the Crimplene

Crimplene

Crimplene is a thick yarn used to make a fabric of the same name. The resulting cloth is heavy, wrinkle-resistant and retains its shape well. Britain's defunct ICI Fibres laboratory developed the fibre in the early 1950s and it is commonly thought it was named after the Crimple Valley in which the...

 fibre. It is a thick, polyester

Polyester

Polyester is a category of polymers which contain the ester functional group in their main chain. Although there are many polyesters, the term "polyester" as a specific material most commonly refers to polyethylene terephthalate...

 yarn used to make a fabric of the same name. The resulting cloth is heavy, wrinkle-resistant and retains its shape well. Britain's defunct ICI Laboratory developed the fibre in the early 1950s and named it after the Crimple Valley

Crimple Valley

Crimple Valley is an area south of Harrogate surrounding the River Crimple . It gave its name to the synthetic yarn Crimplene, which was developed at the nearby ICI Laboratory....

 in which the company was situated.
An alternative reason for the name chosen is that is crimped (ie bulked up) Terylene.