Geoff, I looked in my atlas, and there is no River Crimple in the index. You aren't making it up, are you?

"(Crimplene)...manufactured by a firm based in Harrogate, North Yorkshire, and was named after the river Crimple, which runs through the town."

Surely people in the fabric business would realize the connection between wrinkles and the cr sound, as in

creased
crinkled
crumpled
and of course:

crimped.