I have a heck of a time getting pics on these forums because of the size limitations so I have a photobucket link at the end so let me know if it works or not.
OK, I used 8 female snaps and 2 male snaps on the T strap as well as 1 eyelet and one brad. For mine I used 1.5 in black elastic, 1 in black elastic, and cut a 2 in wide piece of duck cloth. Your sizes may vary in length but I will use mine as this is just an example.
-First get the chest and back plate set where you need to. Measure your gap between the two and you will get how wide you need to cut your white cover. Mine is 2 in.
-Next I figured out how much of the 2 in black elastic I needed to join the two. Mine was about 6 in long so I could set the snaps on the armor down a bit, you can go shorter or longer but this was a nice size for me and it allows some give if you move a lot or ever get snagged.
-Then you need to figure out where your shoulder bells line up and measure the gap. I have about an inch gap in mine.
-Once you have those 3 cut I layed the 1.5 in black elastic down, then the duckcloth on top, centered, and making a T. Then the 1 in piece on top of the duckcloth, see attached pics
-I punched an eyelet through all three in the center where they all meet and put a brad through it to help keep it all together niceand neat.
-For the 1.5 in elastic I outthe 4 female snaps facing down as well as on the 1 in piece of elastic, for the 1 in piece you will need to measure inside the shoulder bell where you want the snaps, I put one close to the top and in the middle.
-On the duck cloth I put the top two female snaps facing up, then wrapped it aroundto see where to place the male snaps, marked it, unfolded it and put the two male snaps facing down, If your lost at this point use the pics as a reference.
-for the snaps on the armor just put the other end of the button snaps through some plastic, I just used a for sale sign cause its thin and easy to push snaps through, set it where you need on the armr, use some E6000 or equivilant, and set them in place.
-Repeat for the other side and You should have it with no sewing required.
The steps eem pretty lengthy put once you do one it shouldnt take long to make the second. I made them with one hand cause I cut my tendon in my finger while working on my scout, Long story so dont ask, so having two hands should make it much easier.
I hope this helps, if yo have questionsfeel free to ask. The tool you can get a almost any craft or fabric store for around 10-115 bucks plus it comes with some snaps, The eyelets I bought at the same store as well. I used a JOANN fabric store so if you have one nearby you can go there, they sell E6000 there as well as GOOP for the boots.
http://s993.photobucket.com/albums/af57/murdock0423/