Thanks
Spent a lot of time on my flak vest today! It was going great until my sewing machine needle broke...
This flak vest closure system is heavily inspired by whitecrow1's flak vest, with zippers sewn in to where princess seams are usually located, and then strapping and parachute buckles to finish holding everything together. Unfortunately I didn't have enough of the zippers that separate and had to use zippers meant for jeans, so the front and back won't actually be able to separate when finished, but it's still enough wiggle room to get in and out. This same pattern will be used to replace the flak vest on my first kit as well, but only one side will open on that one (but will fully separate).
It's not quite all put together because my sewing needle busted in the middle of finishing the right side, and I still need to make shoulder bells and a neck seal, but it's most of the way there. The neck seal is going to be removable by zipper so it will be easier to wash out all the makeup I will inevitably get on it if the zabrak thing goes well.
The individual parts, which were made into a pattern so I can easily replicate it:

Front view, no plates:

What the side looks like closed (the straps will be shortened after I have my flight suit and know exactly how the flak vest will fit over):

Full view of the finished side:

With front plate templates:

With back plate templates:

The one thing I'm concerned about is the lack of any extra room on the front when the plates are on. There's a slight seam allowance that I could maybe buy half an inch with, and the collar plate could be a bit shorter, moving everything up, if it turns out to be a real problem. If that doesn't work, I'll just have to add more material to the bottom.
It's all also a bit snugger than I intended, but that's easily solved by just ripping out the zippers and moving them an inch or so out.
The shoulder tabs don't quite match up either, but the neck was a tight squeeze in the first place, and I expect they will be easy to fix when it's time for the neck seal.