Actually the suits from the first trilogy were sewn with only one zipper that started from the right armpit going down the side, then cutting across the lower back under the red belt section and then going back up the other side to the left armpit. So it was like a U shape. You could do the same thing with the new design, but I would recommend going across the lower back at the top of the red belt section, there is no reason to cut under it and it wouldn't look as good because the new suit doesn't have the raise urethane webs and the zipper seem would be more noticeable if you had it go through the red section.
The zipper is very tiny itself and is called an invisible zipper and it gets sewn in a way so that when it is zipped up, it just looks like a fabric stitch seem. You wouldn't want to use two zippers meeting in the middle, cause then you can see the zippers and the hole in the fabric where they meet. I've seen that allot and it's an eyesore. You could also go an extra step further to hide the zipper. It is very tiny, but you can still see it hanging in your armpit if your arm is away from your body. So I recommend cutting off the finger grip piece used to pull the zipper and have someone use a paperclip inserted into the loop to zip and unzip it for you and then remove it. This way the only thing left of the zipper is the piece that pulls the two sides of teeth together. So now there will be nothing hanging in the armpit and people will have no clue how the hell you put it on.