Quilt backing - cotton/poly flat sheet or pieced cotton
After getting a sticker shock for wide/backing fabric at Joanns I went to Walmart and bought flat sheets for $5. They are 60% cotton and 40% polyester. Can I use it for backing? I have a receipt, I can always take them back. At Walmart I also found fabric clearance bin and bought total of 7 yds of different cotton fabric for $1/yard or $2/yard which would have to be pieced to make the backing. Cotton/poly sheet or pieced backing?