Do you hate finishing the edges of facings as much as I do? Folding down that teeny tiny little hem on the curved edges of the facing is mucho annoying. So, I handle the whole situation another way. Check it out below.
1. Cut out the facing in your fashion fabric and in your interfacing just like normal.
2. Pin each fashion fabric piece to an interfacing piece, right sides together (this means that the right side of the fashion fabric and the non-gluey side of the interfacing should be together).
3. Sew a 5/8" seam on the edge.
4. Trim the seam to 1/4" in width. This makes the next step easier.
5. Turn the interfacing over so that the wrong side of the fashion fabric and the gluey side of the interfacing are together. Carefully iron the interfacing to the fashion fabric, ensuring that the interfacing does not show on the good side of the fashion fabric along the curved seam.
6. Stand back and admire your handiwork. You now have a fully enclosed seam that is finished beautifully and cleanly! Hungry Zombie says, "Sew smart. Use your braaaaains..."
The facing in the pictures above is for view B of Butterick 5567, which I have making out of a wool/polyester blend gabardine (which is behaving like a royal PITA, but, that is a story for another day).