The whole concept of a quilt came about out of practicality, not as a form of art and beauty. A woman would literally create a valuable necessity out of garbage(worn out clothing). Those ugly 70s era quilts made of old polyester scraps might be the last of the practical quilts. I’ve seen some even made out of denim scraps. The ugly polyester years came and went fairly quickly. I’m talking about the thick semi stretchy polyester that old fat ladies of rural areas wouldn’t stop wearing when polyester went out of style in the late 70s. We will probably never see cloth made like that ever again. Maybe someday people will be fascinated by those ugly old polyester quilts.
I know exactly what you are talking about, the stretchy double knit. I wore plenty of it. My dad worked for a textile manufacturer. His plant didn't make that stuff, but some of their plants did, and occasionally they would bring some and sell it to employees, cheap. My mother didn't sew but we'd have clothes made out of it.
In the summer (in the hot humid Southeast) it didn't "breathe" and it was miserable to wear. That same "quality" is probably why your quilts are so warm!
Men wore it too; remember "Leisure Suits?"