After the test post (thank you for your input, I'm debating/considering options) let's get back to sewing.
A while ago I learned about a great, yet simple technique to avoid the little pucker at the end of an invisible zipper. I insert my zipper this way all the time. Though the trick is at the last step of inserting the zipper, I include all steps I do for inserting a zipper.
Disclaimer: as always when I do a tutorial, there are more ways to do it, this is just my take on it.
Step 1 - preparation
- Apply a strip of non-stretch interfacing where you insert the zipper, at least it should not stretch in the length of the zipper.
- Finish the edges
- Do NOT sew the seam under the zipper
Step 2 - inserting the zipper
If you haven't inserted such an invisible zipper often, it's a good idea to visualise how the zipper has to be positioned.
- Open the zipper and fold it over so that the front of the tape is on the right side of the fabric.
- Pin the tape to the fabric (and baste if you want to match stripes/plaids or have slippery fabric)
- Stitch with a special foot for invisible zippers. I love my Bernina foot for this, but use the foot suitable for your machine.
- Stitch as far as you can, till the slider is in the way.
- Make a few back stitches to finish.
- Fold over and pin and stitch the other side of the zipper tape in the same way, again till the slider stops you (for me that always makes the stitching end at the same spot).
Step 3 - finishing the seam
The trick not to get a pucker at the end is not matching the stitching lines. Leave 1 or 2 mm in between the stitch of the seam line and the stitch line of the zipper.
Below three photos of the result , first without pressing and then after pressing.