Denim quilts are usually done in bigger squares due to the thickness of the seam allowances. Might I suggest that you use 1 inch strips between your 3 inch squares so the seam allowances can be pressed into the sashing? You will end up with 1/2 inch sashing between the denim and it looks nice.( Unless you are using larger then 1/4 inch seams, in which case increase the size of your sashing. )You can also do your quilting down the middle of the sashing and it won’t be as thick to quilt through.
Last edited by Tartan; 07-31-2018 at 12:33 PM.