so it’s kind of in the style of a pullover, with a partial zipper placket in the front….at least that’s what I’m imagining. Check out this pattern: https://butterick.mccall.com/b6241?page_id=147 The next time you’re at the fabric store, you should look it up and maybe just check out the zipper steps (or take a pic with your phone). It might not be exactly what you’re thinking of, but give you an idea on how to put in a partial zipper. We don’t have a tutorial on this particular thing, but may have one in the future.