I love quilts made from shirts and other fabrics. I don’t have any suggestions on cutting the bed skirts for you, have never tried it. I’d probably cut up to the seam but not sure that this is the best way.
I made 1 shirt quilt years ago as a memory quilt for a friend’s Mom. Didn’t know about this tutorial then or I would have given it a try. Maybe you’ll find it helpful.
http://thethriftyquilter.blogspot.co...e-thrifty.html
I’d love to see pictures when you are finished.