Adding trim to a pillow is a great way to change the look of your current pillows. It is very easy to add trim if your pillows use pillow covers. However you can still add trim to pillows that do not use pillow covers. There are many different types of trim, as some are small and circle the pillows and others, like tassels, create a very decorative edge that extends from the pillow. When sewing on trim a zipper foot is needed as this produces a seam that is very close to the edge of the pillow and trim.
Iron the trim so that it will lay flat against the pillow.
Place the trim so that it is at the very edges of the pillow, along the pillow seams. If your pillows have pillow covers, remove the pillow cover and attach the trim to the cover. The trim can be flush with the seam or it can extend beyond the side of the pillow, this depends on the type of trim being used. Make sure that the right side of the trim is facing towards the pillow and the wrong side, or sewing side is facing out. Pin the trim in place so it does not move. Make sure you do not stretch the trim when pinning it into place.
Use a sewing machine to sew the trim to a pillow cover. A zipper foot is the best as this will sew the trim as close to the edge seam as possible. This produces a nice clean seam.
Flip the trim so that the right side is facing out and iron. The ironing ensures that the trim stays in the right positions. Without ironing, the trim will flip so the right side is still facing down, like when you sewn the trim on.