How do you get the wrinkles in like maybe the trim? I know how, I mean how do you join the two pieces of fabric together? Do you just wrinkle the fabric and then sew a line to hold the wrinkles in and then sew your other fabric to it just like if you were doing it without the wrinkles or what? I broke out the old sewing machine and started on some of my interior. I decided to add some wrinkles now.