I've unpicked the zipper twice - Grrrrr! I do not get a smooth insertion, the edges wobble like an ocean tide coming in. Help?
I can't tell from your post if you're just sewing with knits, or inserting a zipper into a hand-knitted project, but here are some helpful links...
Adjusting a zipper to make it knit-able.
Hand-basting might be helpful.
Have you done the "Mena Test"?AKA, is it stretchy enough that you can get away with not using a zip?
Interfacing the seam allowance is my only other idea.
Yes, the Mena Test worked! Thanks to all for your suggestions. Now for the hem....