quilting samples with pre-washed and unwashed fabrics

Quilting test swatches with pre-washed and unwashed fabrics

What’s the difference between quilting with pre-washed fabrics and fabrics straight from the bolt? Should I use cotton or polyester thread? As the quilt “final exam” project from School of Sewing approaches, I wanted to run some tests to get a better idea of what kind of outcomes to expect with these different variables. I was pretty sure I’d like the effect of non pre-washing the fabrics, because those would have a larger chance of getting more crinkly, which is my preference. The fabrics for my actual quilt will be a combination of quilting cottons, linen/cotton blends, and chambray, and from what I’ve read…