"I do it all the time. I also mix washed and unwashed fabrics in the same quilt. I've never had a problem. My quilts are not works of art not are they heirloom pieces. They are meant to be used and washed and dragged around."
The only person I knew that quilted was my Grandma. She used any available material in her quilts. So...I had a wildly patterned skirt and shirt that had been given to me years ago that I did not wear. I decided to cut it into 5"squares and make the sashed disappearing 9-patch from Missouri star. The material is nylon, the sashing is cotton. It takes a little time and when I am finished I will call whatever I make "Maggie" and I will think of my Grandmother every time I use it. I remember seeing my old clothes in her quilts, such good memories of her.