I was once the proud owner of a pair of crimpolene flared trousers. I used to wear them on stage in the seventies, complete with platform shoes, paisley shirt, kipper tie and a jacket with a piped braid around the edges.
I looked a complete twat but I wasn't the only one because I played in a trio of twats!
My abiding memory of the aformentioned crimpolene garment was their tremendous elasticity which was, however, rendered ineffective due to their complete inability to return to their previous form after being stretched.
Every time I bent at the knee I had to spent a short time trying to pull the knee of the garment back into shape or risk going on stage looking as if I suffered from some terrible knee deformity.

I was once relating these same memories to the wife of a close friend who was fiercely defensive of crimpolene. It turned out that her father invented it!!
I'm sure I could get the low-down on the naming of the product if anyone's interested.

C-flat. (especially around the knees!)