I have 2 wool patchwork quilts and the wool was sewn exactly like cotton would be, except that it was cut into 4 inch squares and those were sewn together without sashing, but the colors of the wool were carefully considered and the quilts were wonderful blended shades of brown , grey, and taupe that graduated almost in waves through out the quilt. The seams are thicker because the fabric is thicker than cotton. My quilts were tied not quilted.The wool was not pretreated in any way.