I was in home depot this morning buying heavy washers for pattern weights and on my way out I passed this display of curtains. Its called window in a box. Last week they were 20 a set.
They are on special now for 5 dollars each. In each box is a curtain rod and two curtain panels. The panels are 42"x84"each. The white ones with either the black or the purple strip at the top are 100% cotton. I opened it up and it feels like it will be really nice to use as sewing fabric, it feels like a light bottomweight fabric. I'm going to dye them and make dresses, skirts, pants, and overalls for my kiddies hopefully. I took all they had left (10 more) I dont think the stores are getting anymore of these especially for this price. RUN to your home depot and see if there are any left. This comes out to just over 1 dollar a yard

Oh and you can have leftover curtain rods for another project