(ICI) developed and trademarked Crimplene in the 1950s. The thick polyester yarn is called Crimplene as is fabric made from this yarn. The yarn can be woven, but was most usually seen in a double knit. Crimplene fabric is heavy, wrinkle-resistant, wash-and-wear and easy to sew.
Crimplene will always give me fond memories. As a young child I remember having numerous outfits and other things made from the fabric. We lived in an area where various family friends worked at the Celenese plant in Millhaven. It was the Millhaven Fibers Plant and was the third polyester plant in the world opening in the fall of 1955. I always just remembered it as Celenese in Millhaven but see that name entered in 1972. It had started life as a polyester tire plant but in the late 60's early 70's it switched to yarns. The reason I had numerous things made from crimplene was the fact that the plant sold ends by the pound. I remember digging through a garbage bag, picking out colours, and then cutting squares so a blanket could be made. It seemed everyone in the neighbourhood had one of these blankets in their car, on the porch, with the picnic basket. It was something that could be thrown on the ground and easily washed out and then hung on the line if it got dirty.
During the 80's lines kept shutting down in the plant and they became one of the many textiles plants that closed or were retrofitted to create something else. Millhaven Fibers ceased to exist and now Celenese creates emulsion polymers and medical molds etc, not crimplene.
Various adverts can be found like the one above showing men's shirts made from the fabric. I mostly just remember men wearing the pants and seeing what was referred to as leisure suits on TV. Like Mr Furley on Three's Company, this is how I practically always picture Don Knotts.