There are no stupid questions!!! Just ones we do not know the answers to yet.
I agree with Debbie. I would not use broadcloth in a quilt. On the very first ever quilt that I made (way back in 1982) I used a fabric for the backing that had a little polyester in it and it was a disaster! I would never recommend using any fabric with polyester in a quilt-it pills horribly and it does not work well with your 100% cottons.