French seams on pillow cases. For those not familiar with this process, you have to sew a seam on the front of the pillow case and then turn the case inside out and sew the second seam. When I am ironing the pillow case after turning it inside out (and before I sew the second seam) I like to iron the seam down, but I can never get the seam to fully come out and so I end up the extra fabric in the seam. Don't know if this is making any sense or not, but if I used a rounded icing knife to push the seam out and then iron on top of it (the knife) it would push the seam out fully. I hope that all made sense. But it is a great idea that I am going to try.
If you don't get those French seams turned correctly, you end up with threads sticking out of the seam on the right side. I try to make the first seam quite small, like 1/8 inch, then press the seam flat to one side. Sometimes it helps to press the seam over both ways. That will give you a crease on both sides so it will be easy to fold the right way. Then I trim the raw edge with ruler and rotary cutter if there are any little threads sticking out. Now the seam will be "clean" after it is sewn.